tegra: sound: Add an audio hub driver

Add a driver for the audio hub. This is modelled as a misc device which
supports writing audio data from I2S.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/drivers/sound/Makefile b/drivers/sound/Makefile
index e155041..077012f 100644
--- a/drivers/sound/Makefile
+++ b/drivers/sound/Makefile
@@ -11,6 +11,7 @@
 obj-$(CONFIG_SOUND_SANDBOX)	+= sandbox.o
 obj-$(CONFIG_I2S_ROCKCHIP)	+= rockchip_i2s.o rockchip_sound.o
 obj-$(CONFIG_I2S_SAMSUNG)	+= samsung_sound.o
+obj-$(CONFIG_I2S_TEGRA)		+= tegra_ahub.o
 obj-$(CONFIG_SOUND_WM8994)	+= wm8994.o
 obj-$(CONFIG_SOUND_MAX98088)	+= max98088.o maxim_codec.o
 obj-$(CONFIG_SOUND_MAX98090)	+= max98090.o maxim_codec.o