ASoC: mediatek: Add AFE platform driver

This is the DPCM based platform driver of AFE (Audio Front End) unit.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Koro Chen <koro.chen@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/sound/soc/mediatek/Makefile b/sound/soc/mediatek/Makefile
new file mode 100644
index 0000000..5f27cc7
--- /dev/null
+++ b/sound/soc/mediatek/Makefile
@@ -0,0 +1,2 @@
+# MTK Platform Support
+obj-$(CONFIG_SND_SOC_MEDIATEK) += mtk-afe-pcm.o