dwc3_gadget_ep_disable gets called before the last request gets
dequeued.
In __dwc3_gadget_ep_disable all started, pending and cancelled
lists for this endpoint will call dwc3_gadget_giveback in
dwc3_remove_requests.
After that no list containing the afterwards dequed request,
therefor it is not necessary to run the dequeue routine.
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>[...]