Instead of looking at all USB (host) devices, just search all DWC3
device tree nodes. This will (1) fix a panic if of_match is zero and (2)
also apply the fixup if the controller is in peripheral mode. Both
happen when the DWC3 USB controller driver is used.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>