pinctrl: adi2: Statize adi_gpio_irq_domain_ops

It's only referenced in this file, make it static.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/pinctrl-adi2.c b/drivers/pinctrl/pinctrl-adi2.c
index 0cc0eec..5c44feb 100644
--- a/drivers/pinctrl/pinctrl-adi2.c
+++ b/drivers/pinctrl/pinctrl-adi2.c
@@ -927,7 +927,7 @@
 	return 0;
 }
 
-const struct irq_domain_ops adi_gpio_irq_domain_ops = {
+static const struct irq_domain_ops adi_gpio_irq_domain_ops = {
 	.map = adi_gpio_irq_map,
 	.xlate = irq_domain_xlate_onecell,
 };