Revert "hikey960: Remove hifi dsp support."

This reverts commit 1d7e5889cd761a9eaecb130c52582d2b0707a08d.

Reason for revert: previous commit broke build_test target, b/219798815

Change-Id: If678459053b79b81de27a1b7d514cc0c6101d97d
diff --git a/hifi/xaf/hifi-dpf/include/audio/xa-mixer-api.h b/hifi/xaf/hifi-dpf/include/audio/xa-mixer-api.h
new file mode 100644
index 0000000..0de1745
--- /dev/null
+++ b/hifi/xaf/hifi-dpf/include/audio/xa-mixer-api.h
@@ -0,0 +1,157 @@
+/*******************************************************************************
+* Copyright (C) 2018 Cadence Design Systems, Inc.
+* 
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to use this Software with Cadence processor cores only and 
+* not with any other processors and platforms, subject to
+* the following conditions:
+* 
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+* 
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+******************************************************************************/
+
+/*******************************************************************************
+ * xa-mixer-api.h
+ *
+ * Mixer component API
+ *
+ ******************************************************************************/
+
+#ifndef __XA_MIXER_API_H__
+#define __XA_MIXER_API_H__
+
+/*******************************************************************************
+ * Includes
+ ******************************************************************************/
+
+#include "xa_type_def.h"
+#include "xa_error_standards.h"
+#include "xa_apicmd_standards.h"
+#include "xa_memory_standards.h"
+
+/*******************************************************************************
+ * Constants definitions
+ ******************************************************************************/
+
+/* ...mixer-specific configuration parameters */
+enum xa_config_param_mixer {
+    XA_MIXER_CONFIG_PARAM_INPUT_TRACKS      = 0,
+    XA_MIXER_CONFIG_PARAM_PCM_WIDTH         = 1,
+    XA_MIXER_CONFIG_PARAM_CHANNELS          = 2,
+    XA_MIXER_CONFIG_PARAM_SAMPLE_RATE       = 4,
+    XA_MIXER_CONFIG_PARAM_FRAME_SIZE        = 5,
+    XA_MIXER_CONFIG_PARAM_BUFFER_SIZE       = 6,
+    XA_MIXER_CONFIG_PARAM_VOLUME            = 7,
+    XA_MIXER_CONFIG_PARAM_NUM               = 8
+};
+
+/* ...component identifier (informative) */
+#define XA_CODEC_MIXER                  1
+
+/* ...global limitation - maximal mixer track number */
+#define XA_MIXER_MAX_TRACK_NUMBER       4
+
+/* ...volume representation */
+#define __XA_MIXER_VOLUME(v)            \
+    ({ u32  __v = (u32)((v) * (1 << 12)); (__v > 0xFFFF ? __v = 0xFFFF : 0); (u16)__v; })
+
+/* ...mixer volume setting command encoding */
+#define XA_MIXER_VOLUME(track, channel, volume) \
+    (__XA_MIXER_VOLUME(volume) | ((track) << 16) | ((channel) << 20))
+
+/*******************************************************************************
+ * Class 0: API Errors
+ ******************************************************************************/
+
+#define XA_MIXER_API_NONFATAL(e)        \
+    XA_ERROR_CODE(xa_severity_nonfatal, xa_class_api, XA_CODEC_MIXER, (e))
+
+#define XA_MIXER_API_FATAL(e)           \
+    XA_ERROR_CODE(xa_severity_fatal, xa_class_api, XA_CODEC_MIXER, (e))
+
+enum xa_error_nonfatal_api_mixer {
+    XA_MIXER_API_NONFATAL_MAX = XA_MIXER_API_NONFATAL(0)
+};
+
+enum xa_error_fatal_api_mixer {
+    XA_MIXER_API_FATAL_MAX = XA_MIXER_API_FATAL(0)
+};
+
+/*******************************************************************************
+ * Class 1: Configuration Errors
+ ******************************************************************************/
+
+#define XA_MIXER_CONFIG_NONFATAL(e)     \
+    XA_ERROR_CODE(xa_severity_nonfatal, xa_class_config, XA_CODEC_MIXER, (e))
+
+#define XA_MIXER_CONFIG_FATAL(e)        \
+    XA_ERROR_CODE(xa_severity_fatal, xa_class_config, XA_CODEC_MIXER, (e))
+
+enum xa_error_nonfatal_config_mixer {
+    XA_MIXER_CONFIG_NONFATAL_RANGE  = XA_MIXER_CONFIG_NONFATAL(0),
+    XA_MIXER_CONFIG_NONFATAL_STATE  = XA_MIXER_CONFIG_NONFATAL(1),
+    XA_MIXER_CONFIG_NONFATAL_MAX    = XA_MIXER_CONFIG_NONFATAL(2)
+};
+
+enum xa_error_fatal_config_mixer {
+    XA_MIXER_CONFIG_FATAL_RANGE     = XA_MIXER_CONFIG_FATAL(0),
+    XA_MIXER_CONFIG_FATAL_TRACK_STATE = XA_MIXER_CONFIG_FATAL(0 + XA_MIXER_CONFIG_NONFATAL_MAX),
+    XA_MIXER_CONFIG_FATAL_MAX       = XA_MIXER_CONFIG_FATAL(1)
+};
+
+/*******************************************************************************
+ * Class 2: Execution Class Errors
+ ******************************************************************************/
+
+#define XA_MIXER_EXEC_NONFATAL(e)       \
+    XA_ERROR_CODE(xa_severity_nonfatal, xa_class_execute, XA_CODEC_MIXER, (e))
+
+#define XA_MIXER_EXEC_FATAL(e)          \
+    XA_ERROR_CODE(xa_severity_fatal, xa_class_execute, XA_CODEC_MIXER, (e))
+
+enum xa_error_nonfatal_execute_mixer {
+    XA_MIXER_EXEC_NONFATAL_STATE    = XA_MIXER_EXEC_NONFATAL(0),
+    XA_MIXER_EXEC_NONFATAL_NO_DATA  = XA_MIXER_EXEC_NONFATAL(1),
+    XA_MIXER_EXEC_NONFATAL_INPUT    = XA_MIXER_EXEC_NONFATAL(2),
+    XA_MIXER_EXEC_NONFATAL_OUTPUT   = XA_MIXER_EXEC_NONFATAL(3),
+    XA_MIXER_EXEC_NONFATAL_MAX      = XA_MIXER_EXEC_NONFATAL(4)
+};
+
+enum xa_error_fatal_execute_mixer {
+    XA_MIXER_EXEC_FATAL_STATE       = XA_MIXER_EXEC_FATAL(0),
+    XA_MIXER_EXEC_FATAL_INPUT       = XA_MIXER_EXEC_FATAL(1),
+    XA_MIXER_EXEC_FATAL_OUTPUT      = XA_MIXER_EXEC_FATAL(2),
+    XA_MIXER_EXEC_FATAL_MAX         = XA_MIXER_EXEC_FATAL(3)
+};
+
+/*******************************************************************************
+ * API function definition (tbd)
+ ******************************************************************************/
+
+#if defined(USE_DLL) && defined(_WIN32)
+#define DLL_SHARED __declspec(dllimport)
+#elif defined (_WINDLL)
+#define DLL_SHARED __declspec(dllexport)
+#else
+#define DLL_SHARED
+#endif
+
+#if defined(__cplusplus)
+extern "C" {
+#endif  /* __cplusplus */
+DLL_SHARED xa_codec_func_t xa_mixer;
+#if defined(__cplusplus)
+}
+#endif  /* __cplusplus */
+
+#endif /* __XA_MIXER_API_H__ */