UPSTREAM: usb: dwc3: gadget: issue ENDTRANSFER conditional on resource_index

UPSTREAM: usb: dwc3: gadget: issue ENDTRANSFER conditional on resource_index

Because of recent changes to transfer handling on
DWC3, we will not get XferComplete unless we
completely fill up our TRB ring. This means that we
might get a Reset or Disconnect without getting a
XferComplete first.

In order to correctly release our allocated Transfer
Resource, we must issue ENDTRANSFER command whenever
dep->resource_index is valid.

Change-Id: I6f78a239e26d754c2472f06789f820d42261d31d
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit 0e146028eebf989e86d3fe9385b76434e954c84e)