RTEMS | Move fatfs to contrib (#5433)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5433



## Summary
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FatFS is imported third-party code, we should move it to the `contrib` folder.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5433
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