misc: isl29020: 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/isl29020.c

@@ -188,7 +188,7 @@ static int isl29020_remove(struct i2c_client *client)
 	return 0;
 }
 
-static struct i2c_device_id isl29020_id[] = {
+static const struct i2c_device_id isl29020_id[] = {
 	{ "isl29020", 0 },
 	{ }
 };