RTEMS | riscv: set defaults for RISCV_MMU_VIRTUAL_ADDRESS_BITS (!1333)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1333

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


## Summary

riscv: set defaults for RISCV_MMU_VIRTUAL_ADDRESS_BITS

Use 32 for rv32 ABI and otherwise use 39 bit virtual addresses.

Fixes #5630


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1333
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