dfu-util with USB physical location support

[Werner Almesberger]

I wrote:
> dfu-util -p 1+0+2

With the latest libusbpath from SVN, this would now be 1-1.3
(just like in sysfs).

Updated dfu-util patch:
http://svn.openmoko.org/developers/werner/dfu-util-r3103.patch

- Werner