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

[ Upstream commit 8f40fc08 ]

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.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20230420212759.29429-3-quic_wcheng@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: 3c7af52c ("usb: dwc3: gadget: Queue PM runtime idle on disconnect event")
Signed-off-by: Sasha Levin <sashal@kernel.org>