hwmon: (pwm-fan, vexpress) 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>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/vexpress.c

@@ -193,7 +193,7 @@ static struct vexpress_hwmon_type vexpress_hwmon_energy = {
 	},
 };
 
-static struct of_device_id vexpress_hwmon_of_match[] = {
+static const struct of_device_id vexpress_hwmon_of_match[] = {
 #if !defined(CONFIG_REGULATOR_VEXPRESS)
 	{
 		.compatible = "arm,vexpress-volt",