BACKPORT: FROMLIST: usb: dwc3: gadget: Clear DEP flags after stop transfers in ep disable

Ensure that dep->flags are cleared until after stop active transfers
is completed.  Otherwise, the ENDXFER command will not be executed
during ep disable.

Fixes: f09ddcfc ("usb: dwc3: gadget: Prevent EP queuing while stopping transfers")
Reported-and-tested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>

Bug: 183733328
Link: https://lore.kernel.org/linux-usb/1616610664-16495-1-git-send-email-wcheng@codeaurora.org/


Change-Id: Ib8027747af37d7c977ea6cc1b00b1977f81da138
Signed-off-by: Wesley Cheng <wcheng@codeaurora.org>