RTEMS | error.h macro cleanup (#5489)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5489



## Summary
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In [cpukit/include/rtems/error.h at line 100](https://gitlab.rtems.org/rtems/rtos/rtems/-/blob/main/cpukit/include/rtems/error.h?ref_type=heads#L100) there is an `#if 0` with some code that was deactivated with the rationale it is not 16-bit clean. We do not care about 16 bit targets anymore, so that rationale doesn't matter. The macros that are beneath the `#else` part are hard-coded for 32-bit. The part with `#if 0` should be restored and tested, and the part with hard-coded values should be removed.

## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5489
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