Input: xtkbd - constify serio_device_id

serio_device_id are not supposed to change at runtime. All functions
working with serio_device_id provided by <linux/serio.h> work with
const serio_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

drivers/input/keyboard/xtkbd.c

@@ -145,7 +145,7 @@ static void xtkbd_disconnect(struct serio *serio)
 	kfree(xtkbd);
 }
 
-static struct serio_device_id xtkbd_serio_ids[] = {
+static const struct serio_device_id xtkbd_serio_ids[] = {
 	{
 		.type	= SERIO_XT,
 		.proto	= SERIO_ANY,