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/release.txt b/hifi/xaf/release.txt
new file mode 100755
index 0000000..cebd1e2
--- /dev/null
+++ b/hifi/xaf/release.txt
@@ -0,0 +1,24 @@
+======================================================================
+Xtensa Audio Framework (XAF) - Hosted solution
+======================================================================
+
+======================================================================
+Revision History
+======================================================================
+
+Version 0.7_Alpha API 1.1 : April 17, 2018
+
++ Alpha Release
++ Built with RG.5 tools
+
++ Added copyrights for makefiles and assembly files.
++ Added float-print (%f) support in DSP trace logs.
+
+----------------------------------------------------------------------
+
+Version 0.6_Alpha API 1.1 : February 15, 2018
+
++ Alpha Release
++ Built with RG.5 tools
+
+----------------------------------------------------------------------