sound: Add a driver for RealTek RT5677

This audio codec is used on samus. Add a driver for it.

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 07b5901..fe3ccd6 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -17,5 +17,6 @@
 obj-$(CONFIG_SOUND_MAX98095)	+= max98095.o maxim_codec.o
 obj-$(CONFIG_SOUND_INTEL_HDA)	+= hda_codec.o
 obj-$(CONFIG_SOUND_I8254)	+= i8254_beep.o
+obj-$(CONFIG_SOUND_RT5677)	+= rt5677.o
 obj-$(CONFIG_INTEL_BROADWELL)	+= broadwell_i2s.o
 obj-$(CONFIG_SOUND_IVYBRIDGE)	+= ivybridge_sound.o