usb: phy: phy-generic: add an ability to reset on resume

Regular USB device gets power down in system suspend.
New hardware designs require to include USB devices as part of main
scheme. If this case the power could be provide to a device
unmanagable. The best option to reset this kind of devices is to
reset it on USB physical interface level.
Add this ability. Using "reset-on-resume" DT-option for usb-generic driver
enables reset nested device on resume event by gpio interface.

Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>

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