spi: fsl-spi: Make of_device_id array const

Make of_device_id array const, because all OF functions handle
it as const.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 98ccd23..9452f674 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -58,7 +58,7 @@
 	.type = TYPE_GRLIB,
 };
 
-static struct of_device_id of_fsl_spi_match[] = {
+static const struct of_device_id of_fsl_spi_match[] = {
 	{
 		.compatible = "fsl,spi",
 		.data = &of_fsl_spi_fsl_config,