Revision 1651

OLPC trac 9969 - make USB work after resume - sort of.  USB 2.0 devices
like mass storage devices and LANs work after resume, so long as you
don't suspend/resume too many times.  Eventually the system dies with
"user area used up", because the device nodes get reloaded every time.
I need to work out how to reuse the device nodes instead of reloading,
but that could get complicated.  I also need to do something about USB 1.1
devices.