pinctrl: sh-pfc: Constify IRQ GPIOs arrays

The arrays are never modified, make them const.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/sh-pfc/sh_pfc.h b/drivers/pinctrl/sh-pfc/sh_pfc.h
index cdd0338..25496c4 100644
--- a/drivers/pinctrl/sh-pfc/sh_pfc.h
+++ b/drivers/pinctrl/sh-pfc/sh_pfc.h
@@ -95,11 +95,11 @@
 
 struct pinmux_irq {
 	int irq;
-	short *gpios;
+	const short *gpios;
 };
 
 #define PINMUX_IRQ(irq_nr, ids...)			   \
-	{ .irq = irq_nr, .gpios = (short []) { ids, -1 } }
+	{ .irq = irq_nr, .gpios = (const short []) { ids, -1 } }
 
 struct pinmux_range {
 	u16 begin;