spi: spi-mxs: Remove check of spi mode bits

The spi core already checks for a slave setting mode bits that we
didn't list as supported when the master was registered.  There is no
need to do it again in the master driver.
Signed-off-by: NTrent Piepho <tpiepho@gmail.com>
Cc: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: NMark Brown <broonie@linaro.org>

drivers/spi/spi-mxs.c

@@ -106,9 +106,6 @@ static int mxs_spi_setup(struct spi_device *dev)
 	if (!dev->bits_per_word)
 		dev->bits_per_word = 8;
 
-	if (dev->mode & ~(SPI_CPOL | SPI_CPHA))
-		return -EINVAL;
-
 	return 0;
 }