usb: dwc2: Add hibernation entering flow by system suspend

Adds a new flow of entering hibernation when PC is
hibernated or suspended.

Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Link: https://lore.kernel.org/r/20210416124811.BBFDBA005C@mailhost.synopsys.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>