spi/mips-lantiq: set SPI_MASTER_HALF_DUPLEX flag

Due to hardware limitations of the spi/flash frontend of the EBU we need to set
the SPI_MASTER_HALF_DUPLEX flag.
Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
Signed-off-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-falcon.c

@@ -423,6 +423,7 @@ static int falcon_sflash_probe(struct platform_device *pdev)
 
 	master->mode_bits = SPI_MODE_3;
 	master->num_chipselect = 1;
+	master->flags = SPI_MASTER_HALF_DUPLEX;
 	master->bus_num = -1;
 	master->setup = falcon_sflash_setup;
 	master->prepare_transfer_hardware = falcon_sflash_prepare_xfer;