RTEMS | riscv: use configured RAM region if defined (!1181)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1181

Project:Branches: gedare/rtems:riscv-bsp-get-memory to rtems/rtos/rtems:main
Author:   Gedare Bloom
Assignee: Gedare Bloom


## Summary

riscv: use configured RAM region if defined

Use the configuration values for RISCV_RAM_REGION_BEGIN and
RISCV_RAM_REGION_SIZE to determine the workspace instead of
using the FDT or linker variables.

Fixes #5545.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1181
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