mmc: rmobile: Add SDHC support for Renesas rmobile ARM SoC

This adds Renesas rmobile ARM SoC's SD/MMC host support.
This drivers tested with Gose board and Koelsch board.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Acked-by: Pantelis Antoniou <panto@antoniou-consulting.com>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index e69de29..7ba85a2 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -0,0 +1,9 @@
+menu "MMC Host controller Support"
+
+config SH_SDHI
+	bool "SuperH/Renesas ARM SoCs on-chip SDHI host controller support"
+	depends on RMOBILE
+	help
+	  Support for the on-chip SDHI host controller on SuperH/Renesas ARM SoCs platform
+
+endmenu