- fix lock initialization  for device tree handling. Well I would be lucky if
   it would be just a device tree like in Solaris.  But after studying the code
   which goes in right now it appears to develop quite fast in to a "just in
   case" and "ad-hoc" inferface mess we have already in /proc. Shit!

   Look for example at the initialization of a device struct. First we have a
   name to the directory encompassing the device and the immediately we fill in
   the georgeous name field - which is enterly unnecessary.

 - Pull locking out from the device type drivers do_request handlers.  This
   allowed us to remove the draddy unlocking on entry to start_request.

   Much more of host controller rigister acces on crutial code paths is
   now covered by the queue access lock.