mmc: core: fix use_spi_crc permissions

Change-Id: I76114489495cdb79ca7d462e38d8aa21ad2dfbd8
Signed-off-by: zwliew <zhaoweiliew@gmail.com>
mmc: core: set spi crc to 0, interested about the performance gains as i havent seen any data comprises for me

Change-Id: I2ba5a3ed4f9e61827a78e340ec85525a080f4eb9
Signed-off-by: zwliew <zhaoweiliew@gmail.com>