usb: dwc3: Do not process request if HWO is set for its TRB

If the HWO bit is set for the TRB (or the first TRB if scatter-gather
is used) of a request, it implies that core is still processing it.
In that case do not reclaim that TRB and also do not process
the request and give it back to the function driver.

Change-Id: Ia9fbaee443ad53d9a52909b0906a1d0ec1f2638a
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>