[usb2] new usb stack and suser in CURRENT

[Olivier Smedts]

Since the suser interface has been removed from HEAD
(http://www.freebsd.org/cgi/getmsg.cgi?fetch=284102+0+current/cvs-src)
I use the following patch to use the new usb2 stack with
latest CURRENT. Of course, PRIV_ROOT is not the right one to use,
see include/sys/priv.h.

-- 
Olivier Smedts                                              _
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