Add a method to unregister the gadget using its config_item.

There can be functions (e.g. mass storage), which in some circumstances
need the gadget stopped. Add a method of stopping the gadget.
Signed-off-by: NAndrzej Pietrasiewicz <andrzej.p@samsung.com>
Signed-off-by: NKyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: NFelipe Balbi <balbi@ti.com>