mmc: sdhci-cadence: add Cadence SD4HC support

Add a driver for the Cadence SD4HC SD/SDIO/eMMC Controller.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/mmc/Makefile b/drivers/mmc/Makefile
index 2b136ea..a543188 100644
--- a/drivers/mmc/Makefile
+++ b/drivers/mmc/Makefile
@@ -64,6 +64,7 @@
 # SDHCI
 obj-$(CONFIG_MMC_SDHCI)			+= sdhci.o
 obj-$(CONFIG_MMC_SDHCI_BCM2835)		+= bcm2835_sdhci.o
+obj-$(CONFIG_MMC_SDHCI_CADENCE)		+= sdhci-cadence.o
 obj-$(CONFIG_MMC_SDHCI_KONA)		+= kona_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_MV)		+= mv_sdhci.o
 obj-$(CONFIG_MMC_SDHCI_S5P)		+= s5p_sdhci.o