sound: x86: link: Add sound support

Add sound support for link, using the HDA codec implementation.

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 2e21a0d..771c116 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -16,3 +16,4 @@
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o
 obj-$(CONFIG_SOUND_MAX98095)	+= max98095.o maxim_codec.o
 obj-$(CONFIG_SOUND_INTEL_HDA)	+= hda_codec.o
+obj-$(CONFIG_SOUND_IVYBRIDGE)	+= ivybridge_sound.o