drivers/mmc: enable CRC

Disabling CRC can increase mmc performance, but it makes system unstable(freeze).

Signed-off-by: cocafe <cocafehj@gmail.com>
drivers/mmc: spi CRC configurable

/sys/module/mmc_core/parameters/use_spi_crc

Signed-off-by: cocafe <cocafehj@gmail.com>