FYI: Short term SMP fixes

[Chris Johns]

Sebastian Huber wrote:
>
> It is possible to further reduce the visibility of internal RTEMS data
> structures. They are only needed by confdefs.h. We have to further split
> up the xyz.h file into a xyzapi.h and xyz.h. The xyzapi.h would contain
> the public API only and xyz.h the data structures required for confdefs.h.

Is 'xyz.h' for the API more natural with 'xyzkern.h' or something like 
this holding the internal kernel parts ?

Chris