UPSTREAM: usb: dwc3: gadget: Refactor EP0 forced stall/restart into a separate API

Several sequences utilize the same routine for forcing the control endpoint
back into the SETUP phase.  This is required, because those operations need
to ensure that EP0 is back in the default state.

Fixes: c9668379 ("usb: dwc3: ep0: Don't prepare beyond Setup stage")
Cc: stable@vger.kernel.org
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20230420212759.29429-2-quic_wcheng@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 280741172
Bug: 277690231
Change-Id: I9b468a021b04e765b074d9b48f46c6e828022705
(cherry picked from commit 8f40fc08 usb-linus)
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Signed-off-by: Udipto Goswami <quic_ugoswami@quicinc.com>
(cherry picked from commit 15e99e4b)