When slave drivers don't set the max_read_size, the spi-mem should directly
use data.nbytes and not limit to any size. But current logic will limit to
the max_write_size.
Signed-off-by: NYe Li <ye.li@nxp.com>
Acked-by: NVignesh Raghavendra <vigneshr@ti.com>
Reviewed-by: NJagan Teki <jagan@amarulasolutions.com>