RTEMS | RISC-V bsp_memory_initialize ignores configured limits (#5545)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5545

Assignee: Gedare Bloom

## Summary
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The implementation of `bsp_memory_initialize()` reads the memory limit from the FDT or falls back to the linker script variable. However this ignores user configuration for `RISCV_RAM_REGION_BEGIN` and `RISCV_RAM_REGION_SIZE` which could be different especially if limiting the usage of the available memory.

Prefer to calculate the memory size from the user configuration first to avoid mismatched expectations.

## Steps to reproduce


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5545
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