USB: dwc3: gadget: drop dead hibernation code

[ Upstream commit bdb19d01 ]

The hibernation code is broken and has never been enabled in mainline
and should thus be dropped.

Remove the hibernation bits from the gadget code, which effectively
reverts commits e1dadd3b ("usb: dwc3: workaround: bogus hibernation
events") and 7b2a0368

 ("usb: dwc3: gadget: set KEEP_CONNECT in case
of hibernation") except for the spurious interrupt warning.

Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20230404072524.19014-5-johan+linaro@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Stable-dep-of: c8540870

 ("usb: dwc3: gadget: Improve dwc3_gadget_suspend() and dwc3_gadget_resume()")
Signed-off-by: Sasha Levin <sashal@kernel.org>