configs: Enable mmc support

This commits enables mmc on the Actions Cubieboard7 board.

Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
diff --git a/configs/cubieboard7_defconfig b/configs/cubieboard7_defconfig
index 2937a54..536b023 100644
--- a/configs/cubieboard7_defconfig
+++ b/configs/cubieboard7_defconfig
@@ -16,3 +16,6 @@
 CONFIG_RTL8201F_PHY_S700_RMII_TIMINGS=y
 CONFIG_ETH_DESIGNWARE=y
 CONFIG_ETH_DESIGNWARE_S700=y
+CONFIG_DM_MMC=y
+CONFIG_MMC_OWL=y
+CONFIG_CMD_MMC=y