reset: sti: 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: Maxime Coquelin <maxime.coquelin@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
diff --git a/drivers/reset/sti/reset-stih407.c b/drivers/reset/sti/reset-stih407.c
index f7a6cb0..827eb3d 100644
--- a/drivers/reset/sti/reset-stih407.c
+++ b/drivers/reset/sti/reset-stih407.c
@@ -126,7 +126,7 @@
 	.channels = stih407_picophyresets,
 };
 
-static struct of_device_id stih407_reset_match[] = {
+static const struct of_device_id stih407_reset_match[] = {
 	{
 		.compatible = "st,stih407-powerdown",
 		.data = &stih407_powerdown_controller,