ARM: imx: udoo_neo: convert to DM_MMC

Convert UDOO Neo to use DM MMC.

Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
Cc: Francesco Montefoschi <francesco.montefoschi@udoo.org>
Cc: Breno Lima <breno.lima@nxp.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/configs/udoo_neo_defconfig b/configs/udoo_neo_defconfig
index 44ca8cf..3df2ac1 100644
--- a/configs/udoo_neo_defconfig
+++ b/configs/udoo_neo_defconfig
@@ -38,6 +38,7 @@
 CONFIG_BOUNCE_BUFFER=y
 CONFIG_DM=y
 CONFIG_DM_GPIO=y
+CONFIG_DM_MMC=y
 CONFIG_FSL_USDHC=y
 CONFIG_PINCTRL=y
 CONFIG_PINCTRL_IMX6=y