spi: npcm-pspi: Use SPI_MODE_X_MASK

Use SPI_MODE_X_MASK instead of open coded variant.

Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-npcm-pspi.c

···
 	u16 regtemp;
 	u16 mode_val;
 
-	switch (spi->mode & (SPI_CPOL | SPI_CPHA)) {
+	switch (spi->mode & SPI_MODE_X_MASK) {
 	case SPI_MODE_0:
 		mode_val = 0;
 		break;