RTEMS | SMP: Add support for the MPCP locking protocol (!1358)

[Gedare Bloom (@gedare)]

Gedare Bloom started a new discussion on cpukit/include/rtems/rtems/semdata.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1358#note_154969

 >  
 >  #if defined( RTEMS_SMP )
 >      MRSP_Control MRSP;
 > +    MPCP_Control MPCP;

these should be a union, if they cannot use the same struct definition. I would however prefer a single struct with some kind of polymorphism/inheritance type of approach, like...

```
struct MRSP_Control {
  Multiprocessor_locking_Control base;
  /* MrsP specific parts here */
};

struct MPCP_Control {
  Multiprocessor_locking_Control base;
  /* MPCP specific parts here */
}
```

The challenge is to embed the information needed in the lock fast path to avoid having to follow pointers.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1358#note_154969
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