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/Kconfig b/drivers/mmc/Kconfig
index c3462ab..0dc903f 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -159,6 +159,18 @@
 
 	  If unsure, say N.
 
+config MMC_SDHCI_CADENCE
+	bool "SDHCI support for the Cadence SD/SDIO/eMMC controller"
+	depends on BLK && DM_MMC_OPS
+	depends on MMC_SDHCI
+	depends on OF_CONTROL
+	help
+	  This selects the Cadence SD/SDIO/eMMC driver.
+
+	  If you have a controller with this interface, say Y here.
+
+	  If unsure, say N.
+
 config MMC_SDHCI_KONA
 	bool "SDHCI support on Broadcom KONA platform"
 	depends on MMC_SDHCI