pinctrl: sh-pfc: ARM: Constify pins and cfg_regs arrays

The arrays are never modified, declare them as 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/pfc-r8a7791.c b/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
index ea02d37..d73a5f3 100644
--- a/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
+++ b/drivers/pinctrl/sh-pfc/pfc-r8a7791.c
@@ -1674,7 +1674,7 @@
 	PINMUX_IPSR_MODSEL_DATA(IP16_11_10, CAN1_RX_B, SEL_CAN1_1),
 };
 
-static struct sh_pfc_pin pinmux_pins[] = {
+static const struct sh_pfc_pin pinmux_pins[] = {
 	PINMUX_GPIO_GP_ALL(),
 };
 
@@ -3056,7 +3056,7 @@
 	SH_PFC_FUNCTION(usb1),
 };
 
-static struct pinmux_cfg_reg pinmux_config_regs[] = {
+static const struct pinmux_cfg_reg pinmux_config_regs[] = {
 	{ PINMUX_CFG_REG("GPSR0", 0xE6060004, 32, 1) {
 		GP_0_31_FN, FN_IP1_22_20,
 		GP_0_30_FN, FN_IP1_19_17,