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/Kconfig b/sound/soc/Kconfig
index 3ba52da..cc1b7187 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -45,6 +45,7 @@
 source "sound/soc/omap/Kconfig"
 source "sound/soc/kirkwood/Kconfig"
 source "sound/soc/intel/Kconfig"
+source "sound/soc/mediatek/Kconfig"
 source "sound/soc/mxs/Kconfig"
 source "sound/soc/pxa/Kconfig"
 source "sound/soc/qcom/Kconfig"