bus/usb update, ural(4) and rum(4)

["Sepherosa Ziehau" <sepherosa@xxxxxxxxx>]

Hi all,

I have updated bus/usb, mainly obtained from FreeBSD's latest ehci work:
http://leaf.dragonflybsd.org/~sephe/usb.diff7
This one should apply cleanly on HEAD/PREVIEW

Above patch is the prerequisite to make following two 802.11 drivers work:
http://leaf.dragonflybsd.org/~sephe/rum.tbz
http://leaf.dragonflybsd.org/~sephe/ural.tbz
These two drivers only work with HEAD

Best Regards,
sephe

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