uboot-imx

ARMV7: MMC SPL Boot support for SMDKV310 board

Added MMC SPL boot support for SMDKV310. This framework design is
based on nand_spl support.

Signed-off-by: Chander Kashyap <chander.kashyap@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>