RTEMS | riscv: use unsigned comparison for address check (!1221)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1221

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


## Summary

riscv: use unsigned comparison for address check

The comparison of a register to see if it holds a number less than
3 needs to be unsigned since the register is otherwise expected to
hold an address that could have the most significant bit set.

Fixes #5561


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1221
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