ENGR00234519 mmc: support eMMC v4.5 memory cards

Bypass eMMC version checking, so that eMMC v4.5 can work on current kernel as
eMMC v4.4 cards, no specific v4.5 feature supported. Only basic read/write
operations are supported, also ddr mode is supported.

Acked-by: Dong Aisheng <b29396@freescale.com>
Signed-off-by: Ryan QIAN <b32804@freescale.com>

Conflicts:

	drivers/mmc/core/mmc.c
MXC SPI: allow SPI bus clock changes
U-MoBo: allow use of both chip select on SPI bus 1