spi: nxp_fspi: Ensure width is respected in spi-mem operations

Import linux commit 007773e16a6f ("spi: nxp-fspi: Ensure width is
respected in spi-mem operations") to fix SPI access on boards which
don't have all SPI I/O lines connected to the flash.

Since commit 71025f01 ("mtd: spi-nor-core: Rework hwcaps selection")
u-boot figures out the capabilities by looking at spi_mem_supports_op().
The FlexSPI driver doesn't take the board layout into account. Fix that.

Fixes: 383fded7 ("spi: nxp_fspi: new driver for the FlexSPI controller")
Signed-off-by: NMichael Walle <michael@walle.cc>
Reviewed-by: NPratyush Yadav <p.yadav@ti.com>
Reviewed-by: NPriyanka Jain <priyanka.jain@nxp.com>

drivers/spi/nxp_fspi.c

@@ -428,7 +428,7 @@ static bool nxp_fspi_supports_op(struct spi_slave *slave,
 	    op->data.nbytes > f->devtype_data->txfifo)
 		return false;
 
-	return true;
+	return spi_mem_default_supports_op(slave, op);
 }
 
 /* Instead of busy looping invoke readl_poll_sleep_timeout functionality. */