rockchip: Add a sound driver

Add a sound driver for rk3288 supporting chromebook_jerry. This uses the
I2S driver, and existing audio codec and the clock/pinmux support.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index 91f255b..d0bf51b 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -9,7 +9,7 @@
 obj-$(CONFIG_SOUND)	+= sound-uclass.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung-i2s.o
 obj-$(CONFIG_SOUND_SANDBOX)	+= sandbox.o
-obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o
+obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o rockchip_sound.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung_sound.o
 obj-$(CONFIG_SOUND_WM8994)	+= wm8994.o
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o