spi: kirkwood_spi: implement mvebu_spi_set_mode()

Set the appropriate bits in the interface config register based
on the SPI_ mode flags.

Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
diff --git a/arch/arm/include/asm/arch-mvebu/spi.h b/arch/arm/include/asm/arch-mvebu/spi.h
index 78869a2..3545aed 100644
--- a/arch/arm/include/asm/arch-mvebu/spi.h
+++ b/arch/arm/include/asm/arch-mvebu/spi.h
@@ -52,6 +52,10 @@
 #define KWSPI_ADRLEN_3BYTE	(2 << 8)
 #define KWSPI_ADRLEN_4BYTE	(3 << 8)
 #define KWSPI_ADRLEN_MASK	(3 << 8)
+#define KWSPI_CPOL		(1 << 11)
+#define KWSPI_CPHA		(1 << 12)
+#define KWSPI_TXLSBF		(1 << 13)
+#define KWSPI_RXLSBF		(1 << 14)
 
 #define KWSPI_IRQUNMASK		1 /* unmask SPI interrupt */
 #define KWSPI_IRQMASK		0 /* mask SPI interrupt */