mmc: uniphier: add driver for UniPhier SD/MMC host controller

Add a driver for the on-chip SD/eMMC host controller used by
UniPhier SoC family.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 9d3f7e9..dc8532f 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -43,4 +43,10 @@
 	help
 	  Support for Arasan SDHCI host controller on Zynq/ZynqMP ARM SoCs platform
 
+config MMC_UNIPHIER
+	bool "UniPhier SD/MMC Host Controller support"
+	depends on ARCH_UNIPHIER
+	help
+	  This selects support for the SD/MMC Host Controller on UniPhier SoCs.
+
 endmenu