pinctrl: constify of_device_id array

of_device_id is always used as const.
(See driver.of_match_table and open firmware functions)

Signed-off-by: Fabian Frederick <fabf@skynet.be>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Acked-by: Maxime Coquelin <maxime.coquelin@st.com>
Acked-by: Hongzhou Yang <hongzhou.yang@mediatek.com>
Acked-by: Lee Jones <lee@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/pinctrl/mvebu/pinctrl-armada-375.c b/drivers/pinctrl/mvebu/pinctrl-armada-375.c
index cd7c8f5..ca1e757 100644
--- a/drivers/pinctrl/mvebu/pinctrl-armada-375.c
+++ b/drivers/pinctrl/mvebu/pinctrl-armada-375.c
@@ -399,7 +399,7 @@
 
 static struct mvebu_pinctrl_soc_info armada_375_pinctrl_info;
 
-static struct of_device_id armada_375_pinctrl_of_match[] = {
+static const struct of_device_id armada_375_pinctrl_of_match[] = {
 	{ .compatible = "marvell,mv88f6720-pinctrl" },
 	{ },
 };