iio: 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 <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/common/ssp_sensors/ssp_dev.c

···
 }
 
 #ifdef CONFIG_OF
-static struct of_device_id ssp_of_match[] = {
+static const struct of_device_id ssp_of_match[] = {
 	{
 		.compatible	= "samsung,sensorhub-rinato",
 		.data		= &ssp_rinato_info,