dwc3: gadget: Stop active transfer pending on ep0 out/in during reset

if USB bus reset is received from Host in middle of control transfer
request, SW needs to complete pending control transfer and setup core
for next setup stage as per data book. Hence check ep0 state during
reset interrupt handling and make sure active transfers on ep0 out/in
endpoint are stopped by queuing ENDXFER command for that endpoint
and restart ep0 out again to receive next setup packet.

Change-Id: Idf8adf3c2416e7945d879bf88c321e1eea3c31d4
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>