USB: dwc3: Handle host resume after failed remote wakeup-up

If remote-wakeup attempt by device had failed, then core
wouldn't give wakeup event after host resumes bus later.
Handle that by resuming gadget on receiving EP event which
indicates that bus has indeed resumed.

Change-Id: Idab5dc11e04116abf9a79fcef68fd38ede07b24a
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>