usbohci: implement smm handover, timeouts, donehead dequeue.

implement SMM emulation driver handover in ohcireset(). this fixes
hang and defunct internal keyboard problems on a acer notebook.

dont spin forever waiting for the controller on soft reset in init().

check both, donehead pointer *and* interrupt status for
processed td event (Wdh) similar to the ohci spec example for
processed tds and unlink immidiately. acknowledge *all* the
interrupt status bits before masking. mask out unhandled
events.

various stuff:

check for christmas light interrupt status (cardbus controller
removed?)

add (missing?) break for Tddataovr error case in qhinterrupt().
(changed on sources, not clear why?)

mask interrupt events on shutdown() (from sources).

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