mfd: da9055: 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: Lee Jones <lee.jones@linaro.org>

drivers/mfd/da9055-i2c.c

@@ -62,7 +62,7 @@ static int da9055_i2c_remove(struct i2c_client *i2c)
  * purposes separate). As a result there are specific DA9055 ids for PMIC
  * and CODEC, which must be different to operate together.
  */
-static struct i2c_device_id da9055_i2c_id[] = {
+static const struct i2c_device_id da9055_i2c_id[] = {
 	{"da9055-pmic", 0},
 	{ }
 };