mmc: mtk-sd: add SD/MMC host controller driver for MT7623 SoC

This patch adds MT7623 host controller driver for accessing SD/MMC.

Cc: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 3f7458d..fbd1396 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -602,6 +602,17 @@
 	help
 		This can enable ftsdc010 sdio function.
 
+config MMC_MTK
+	bool "MediaTek SD/MMC Card Interface support"
+	depends on ARCH_MEDIATEK
+	depends on BLK && DM_MMC
+	depends on OF_CONTROL
+	help
+	  This selects the MediaTek(R) Secure digital and Multimedia card Interface.
+	  If you have a machine with a integrated SD/MMC card reader, say Y or M here.
+	  This is needed if support for any SD/SDIO/MMC devices is required.
+	  If unsure, say N.
+
 endif
 
 config TEGRA124_MMC_DISABLE_EXT_LOOPBACK