RTEMS | cpukit: add LLVM _clang-format files (!983)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/983

Project:Branches: gedare/rtems:reformat-debugger to rtems/rtos/rtems:main
Author:   Gedare Bloom
Assignee: Gedare Bloom
Reviewer: Chris Johns


## Summary

cpukit: add LLVM _clang-format files

Add configuration files to use the LLVM format for specific
subdirectories.

updates #5343
updates #5344
updates #5342


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