gpio: zevio: 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: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-zevio.c

@@ -202,7 +202,7 @@ static int zevio_gpio_probe(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id zevio_gpio_of_match[] = {
+static const struct of_device_id zevio_gpio_of_match[] = {
 	{ .compatible = "lsi,zevio-gpio", },
 	{ },
 };