gpio: Constify irq_domain_ops

The irq_domain_ops are not modified by the driver and the irqdomain core
code accepts pointer to a const data.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski.k@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-sodaville.c

@@ -125,7 +125,7 @@ static int sdv_xlate(struct irq_domain *h, struct device_node *node,
 	return 0;
 }
 
-static struct irq_domain_ops irq_domain_sdv_ops = {
+static const struct irq_domain_ops irq_domain_sdv_ops = {
 	.xlate = sdv_xlate,
 };