USB: dwc3: msm: Fix error handling with dwc3_msm_ep_queue()

If __dwc3_msm_ep_queue() fails, then req_complete is freed
but it is not being removed from mdwc->request_list. This
may result into list_add corruption issue on next USB cable
connect when USB endless request is queued. Fix this issue
by deleting req_complete from mdwc->req_complete_list.

CRs-Fixed: 1007571
Change-Id: I00300bc529db75593939a13fbea33acefa717da5
Signed-off-by: Mayank Rana <mrana@codeaurora.org>