usb: dwc3-am62: Add support for system wakeup based on USB events

The USB2SS IP in TI's AM62 SoC is capable of supporting wakeup from
deep sleep based on the following events,

1) VBUS state change
2) Overcurrent detection
3) Line state change

Wakeup from these events can enabled by setting their corresponding bits
in the WAKEUP_CONFIG register. The events to be enabled are decided based
on the current role of the controller.

When the role of the controller is host, the comparators for detecting
VBUS state change are disabled while entering low power mode. This is done
as VBUS state is not used in host mode and disabling the comparators helps
in reducing the power consumption. So, wakeup from VBUS state change should
be disabled in host mode. While operating in peripheral mode all the wakeup
events can be enabled.

Therefore, add support for the same in the suspend/resume hooks.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20230316131226.89540-2-rogerq@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>