RTEMS | bsps/arm/*: Add linker args to find correct __sync_synchronize implementation (!520)

[Joel Sherrill (@joel)]

Joel Sherrill created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/520

Project:Branches: joel/rtems:arm-sync_synchronize-5268 to rtems/rtos/rtems:main
Author:   Joel Sherrill
Assignee: Joel Sherrill



## Summary

bsps/arm/*: Add linker args to find correct __sync_synchronize implementation

GCCC 14 introduced a linking warning about not knowing which
__sync_synchronize implementation to use. The BSPs impacted
are updated in this commit. The suggested correction is to
use -specs to pick up a GCC specific specs file which changes
__sync_synchronization to the desired implementation
__sync_synchronization_MECHANISM. Using this solution ties
the code to GCC 14+ since the spec files are not in GCC 13.

Closes #5268

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