mfd: as3711: Make of_device_id array const

Array of struct of_device_id may be be const as expected by
of_match_table field.

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>

drivers/mfd/as3711.c

···
 };
 
 #ifdef CONFIG_OF
-static struct of_device_id as3711_of_match[] = {
+static const struct of_device_id as3711_of_match[] = {
 	{.compatible = "ams,as3711",},
 	{}
 };