mpc52xx_spi: add missing mode_bits definition

V2 changes:
* remove CS_HIGH mode
Signed-off-by: Luotao Fu <l.fu@pengutronix.de>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/mpc52xx_spi.c

@@ -430,6 +430,8 @@ static int __devinit mpc52xx_spi_probe(struct of_device *op,
 	master->num_chipselect = 1;
 	master->setup = mpc52xx_spi_setup;
 	master->transfer = mpc52xx_spi_transfer;
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST;
+
 	dev_set_drvdata(&op->dev, master);
 
 	ms = spi_master_get_devdata(master);