Add a proper module alias so the driver can be autoloaded when the
parent axp20x mfd driver registers its cells.
Signed-off-by: NChen-Yu Tsai <wens@csie.org>
Acked-by: NCarlo Caione <carlo@caione.org>
Signed-off-by: NDmitry Torokhov <dmitry.torokhov@gmail.com>