RTEMS | testsuites/validation: add riscv Smrnmi tests (!1506)

[Lucian Silistru (@lsilistr)]

Lucian Silistru created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1506

Project:Branches: lsilistr/rtems:5682-smrnmi-handlers-test to rtems/rtos/rtems:main
Author: Lucian Silistru

## Summary

testsuites/validation: add riscv Smrnmi tests
    
Added 3 manually generated Smrnmi testsuites.

Closes #5682

## AI Details
Interactive session asking to find a location and format for the test.
Then to port existing test to RTEMS framework.

### Prompt used
None. Interactive session

### AI model used
Claude Opus 5

### How AI was used for the contribution

- [ ] Formatting
- [x] Test creation.
- [ ] Code comments.
- [ ] The entire contribution was generated using AI
- [ ] AI code completion such as Copilot in VSCode.

If others were used please add below

### Access
I have not used a product that claims copyright. I have legitimate access.


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