mmc: gen_atmel_mci: add driver model support for mci

Add the driver model support for Atmel mci while retaining the
existing legacy code. This allows the driver to support boards
that have converted to driver model as well as those that have not.

Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
index 077b184..6ac26dd 100644
--- a/drivers/mmc/Kconfig
+++ b/drivers/mmc/Kconfig
@@ -371,6 +371,15 @@
 	  This selects support for the SD/MMC Host Controller on
 	  Allwinner sunxi SoCs.
 
+config GENERIC_ATMEL_MCI
+	bool "Atmel Multimedia Card Interface support"
+	depends on DM_MMC && BLK && DM_MMC_OPS && ARCH_AT91
+	help
+	  This enables support for Atmel High Speed Multimedia Card Interface
+	  (HSMCI), which supports the MultiMedia Card (MMC) Specification V4.3,
+	  the SD Memory Card Specification V2.0, the SDIO V2.0 specification
+	  and CE-ATA V1.1.
+
 endif
 
 config TEGRA124_MMC_DISABLE_EXT_LOOPBACK