usb: dwc3: gadget: Continue handling EP0 xfercomplete events

During soft disconnect, EP0 events are expected to be handled in order to
allow the controller to successfully move into the halted state.  Since
__dwc3_gadget_stop() is executed before polling, EP0 has been disabled, and
events are being blocked.  Allow xfercomplete events to be handled, so that
cached SETUP packets can be read out from the internal controller memory.

Without doing so, it will lead to endxfer timeouts, which results to
controller halt failures.

Reviewed-by: Thinh Nguyen <[email protected]>
Signed-off-by: Wesley Cheng <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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