uboot-imx

sata: use block layer for sata command

Call blk_dread, blk_dwrite, blk_derase to ensure that the block cache is
used if enabled and to remove build breakage when CONFIG_BLK is enabled.

Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Tom Rini <trini@konsulko.com>