configs: dra74_evm: enable mmc driver model

enable mmc driver model for dra74 evm as omap_hsmmc
supports driver model

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/dra74_evm_defconfig b/configs/dra74_evm_defconfig
index 9039b15..5f50004 100644
--- a/configs/dra74_evm_defconfig
+++ b/configs/dra74_evm_defconfig
@@ -24,3 +24,4 @@
 CONFIG_OMAP_TIMER=y
 CONFIG_USB=y
 CONFIG_USB_GADGET=y
+CONFIG_DM_MMC=y