via the client USB on the pxa270, as it appears USB port 2 is the
externally routed port.
The linux driver was used as documentation for GPIO pins and port
settings.
Note that this only seems to work for one boot, a reboot loses for some
reason, perhaps something in the USB client area needs to be configured.
XXX: perhaps we should make zusb a device that attached/detaches the USB
USB host or client device depending on the plugged in cable.
ed87ed8b00