RTEMS | risc-v: FDT copy fails if BSP_FDT_BLOB_READ_ONLY is false (#5543)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5543

Assignee: Gedare Bloom

## Summary
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When `BSP_FDT_BLOB_READ_ONLY` is `False` the FDT gets copied into the BSS section before clearing the BSS during system initialization. This causes the FDT to get zeroed out after being copied.

## Steps to reproduce
Use config:
```
[riscv/rv64imafdc]
BSP_FDT_BLOB_READ_ONLY = False
```
configure and build, run hello.exe and it hangs.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5543
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