USB: dwc3: gadget: drop dead hibernation code

USB: dwc3: gadget: drop dead hibernation code

[ Upstream commit bdb19d01026a5cccfa437be8adcf2df472c5889e ]

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 03487380d08d ("usb: dwc3: workaround: bogus hibernation
events") and 314f357539c2 ("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: 39674be56fba ("usb: dwc3: gadget: Execute gadget stop after halting the controller")
Signed-off-by: Sasha Levin <sashal@kernel.org>