• Implement and use a common device bus state.  The main side-effect is
    that creating a bus and attaching it to a parent device are no longer
    separate operations.  For legacy code we allow a NULL parent, but that
    should go away eventually.
    
    Also tweak creation code to veriry theat a device in on the right bus.
    
    Signed-off-by: Paul Brook <paul@codesourcery.com>
    Paul Brook authored
     
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