power: 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>

[for vexpress]
Acked-by: Sudeep Holla <sudeep.holla@arm.com>

Signed-off-by: Sebastian Reichel <sre@kernel.org>

drivers/power/reset/keystone-reset.c

@@ -70,7 +70,7 @@ static struct notifier_block rsctrl_restart_nb = {
 	.priority = 128,
 };
 
-static struct of_device_id rsctrl_of_match[] = {
+static const struct of_device_id rsctrl_of_match[] = {
 	{.compatible = "ti,keystone-reset", },
 	{},
 };