usb: musb: gadget: get rid of stop_activity()

that function is pretty close to a no-op by now,
all we need is a call to musb_stop().

Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Felipe Balbi 2015-02-02 17:14:12 -06:00
commit d5638fcf15