Always assign the device address found by the USB stack even if it

Always assign the device address found by the USB stack even if it
does not match the hardware address.

This change only matters for xHCI buses where the controller assigns
device addresses.  But it is the simplest way to comply with the stack
requirement of assigning the first `logical' address to the root hub
device.

Device addresses are not much used anyway and a cleanup will follow to
avoid possible confusions.

This makes usbdevs(8) correctly report devices connected to xhci(4).