pinctrl: freescale: make of_device_id array const

Make of_device_id array const.
Signed-off-by: Sanjeev Sharma <Sanjeev_Sharma@mentor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/freescale/pinctrl-vf610.c

@@ -302,7 +302,7 @@ static struct imx_pinctrl_soc_info vf610_pinctrl_info = {
 	.flags = SHARE_MUX_CONF_REG,
 };
 
-static struct of_device_id vf610_pinctrl_of_match[] = {
+static const struct of_device_id vf610_pinctrl_of_match[] = {
 	{ .compatible = "fsl,vf610-iomuxc", },
 	{ /* sentinel */ }
 };