sound: Add support for Intel HDA

The Intel High-definition Audio is a newer-generation audio system which
provides for transfer of a large number of audio stream, each containing
up to 16 channels.

Add support for HDA as a library which can be used by other drivers.
U-Boot currently uses only two channels (stereo).

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index 170e06a..2e21a0d 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -15,3 +15,4 @@
 obj-$(CONFIG_SOUND_MAX98088)	+= max98088.o maxim_codec.o
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o
 obj-$(CONFIG_SOUND_MAX98095)	+= max98095.o maxim_codec.o
+obj-$(CONFIG_SOUND_INTEL_HDA)	+= hda_codec.o