spi/bfin_spi: constify pin array

This array isn't written anywhere, so constify it.
Signed-off-by: NMike Frysinger <vapier@gentoo.org>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

drivers/spi/spi-bfin5xx.c

@@ -965,7 +965,7 @@ static int bfin_spi_transfer(struct spi_device *spi, struct spi_message *msg)
 
 #define MAX_SPI_SSEL	7
 
-static u16 ssel[][MAX_SPI_SSEL] = {
+static const u16 ssel[][MAX_SPI_SSEL] = {
 	{P_SPI0_SSEL1, P_SPI0_SSEL2, P_SPI0_SSEL3,
 	P_SPI0_SSEL4, P_SPI0_SSEL5,
 	P_SPI0_SSEL6, P_SPI0_SSEL7},