spi: oc-tiny: Use SPI_MODE_X_MASK

Use SPI_MODE_X_MASK instead of open coded variant.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210510131217.49357-4-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-oc-tiny.c

@@ -86,7 +86,7 @@ static int tiny_spi_setup(struct spi_device *spi)
 		hw->speed_hz = spi->max_speed_hz;
 		hw->baud = tiny_spi_baud(spi, hw->speed_hz);
 	}
-	hw->mode = spi->mode & (SPI_CPOL | SPI_CPHA);
+	hw->mode = spi->mode & SPI_MODE_X_MASK;
 	return 0;
 }