RTEMS | riscv: add helper functions (!1239)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1239

Project:Branches: gedare/rtems:riscv-fence to rtems/rtos/rtems:main
Author:   Gedare Bloom
Assignee: Gedare Bloom


## Summary

riscv: add helper functions for inline asm fence/barrier and sfence.vma.

Closes #5544

Updates #5540

## Generative AI

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