RTEMS | cpukit/score/.../cpu.h: Implement _CPU_Spin_wait() (!1256)

[Wayne Thornton (@wmthornton-dev)]

Wayne Thornton created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1256

Project:Branches: wmthornton-dev/rtems:cpu-spin-wait to rtems/rtos/rtems:main
Author:   Wayne Thornton
Assignee: Wayne Thornton
Reviewer: Gedare Bloom

## Summary

cpukit/score/.../cpu.h: Implement _CPU_Spin_wait()

`_CPU_Spin_wait()` is an assembly function which prevents
aggressive speculative execution by the CPU during spin-wait
loops. Added benefit is reduction of thermal load. This
function is part of the Deterministic Hedged Read Library API.

Similar architecture-specific assembly functions will be needed for other RTEMS_SMP 
capable BSPs that the DHRL API is ported to. 


## Generative AI

No AI was used in the creation of this commit.


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