BACKPORT: usb: dwc3: gadget: Do not clear ep delayed stop flag during ep disable

DWC3_EP_DELAYED_STOP is utilized to defer issuing the end transfer command
until the subsequent SETUP stage, in order to avoid end transfer timeouts.
During cable disconnect scenarios, __dwc3_gadget_ep_disable() is
responsible for ensuring endpoints have no active transfers pending.  Since
dwc3_remove_request() can now exit early if the EP delayed stop is set,
avoid clearing all DEP flags, otherwise the transition back into the SETUP
stage won't issue an endxfer command.

Bug: 280698396
Bug: 276227797
Bug: 283204968
Fixes: 2b2da657 ("usb: dwc3: Avoid unmapping USB requests if endxfer is not complete")
Reviewed-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Change-Id: I4453c4ddfe7ad15e9c5b1ba2be09d20cac72b0bf
Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
Link: https://lore.kernel.org/r/20220919231213.21364-1-quic_wcheng@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 76bff31c)
(cherry picked from commit c0b28ac8)
Signed-off-by: Srinivasarao Pathipati <quic_spathi@quicinc.com>