RTEMS | Reformat cpukit rtems src (!237)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/237

Project:Branches: gedare/rtems:reformat-cpukit-rtems-src to rtems/rtos/rtems:main
Author:   Gedare Bloom




## Summary

This is a first attempt at automatic formatting using `clang-format`. I'm working on making the build of `clang-format` necessary to recreate this formatter part of RSB. At the moment it requires building the llvm-project.git with some extra patches that are pending acceptance to the upstream.

Please provide feedback especially on undesirable changes.

A few notes:
* return statements are now aligned with the space character after `return`. This is a default behavior of `clang-format` and seems unnecessary to change, but it does result in quite a few whitespace changes.
* we have a mix of `[]` and [ ]` without and with spaces. I decided to go with spaces, as there seemed to be fewer changes that way. It is also more in-line with the prevailing rtems style that encourages more horizontal spacing.

I'm not sure the best timing, but I think we should try to make these changes at/near the release point, either before or after it.

I rebuilt and tested using `erc32-sis` and `leon3-sis` (SMP). 

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