RTEMS | Remove SMP Simple Scheduler (#5192)

[Joel Sherrill (@joel)]

Joel Sherrill created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5192



## Summary
This was added as an initial SMP scheduler and there is no indication that anyone has used it. It is outlived its usefulness.

Remove the scheduler as well as associated configuration, tests, and documentation.

### Pre-set options

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5192
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