media: adv7842: constify i2c_device_id

i2c_device_id are not supposed to change at runtime. All functions
working with i2c_device_id provided by <linux/i2c.h> work with
const i2c_device_id. So mark the non-const structs as const.
Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

drivers/media/i2c/adv7842.c

@@ -3607,7 +3607,7 @@ static int adv7842_remove(struct i2c_client *client)
 
 /* ----------------------------------------------------------------------- */
 
-static struct i2c_device_id adv7842_id[] = {
+static const struct i2c_device_id adv7842_id[] = {
 	{ "adv7842", 0 },
 	{ }
 };