pinctrl: at91: Make at91_gpio_template const

This template is only assigned, so make it const.
Signed-off-by: Alexander Stein <alexanders83@web.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/pinctrl-at91.c

@@ -1652,7 +1652,7 @@ static int at91_gpio_of_irq_setup(struct platform_device *pdev,
 }
 
 /* This structure is replicated for each GPIO block allocated at probe time */
-static struct gpio_chip at91_gpio_template = {
+static const struct gpio_chip at91_gpio_template = {
 	.request		= gpiochip_generic_request,
 	.free			= gpiochip_generic_free,
 	.get_direction		= at91_gpio_get_direction,