RTEMS | risc-v fatal error missing FDT (#5561)

[Gedare Bloom (@gedare)]

Gedare Bloom created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5561

Assignee: Gedare Bloom

## Summary
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Reported on https://users.rtems.org/t/unknown-error-while-running-tests-using-qemu/799

The root problem is that the FDT is missing since 2c16558469b6356d11b88a05030397efb37e72af


Backtrace:
```
Breakpoint 1, _RISCV_Vector_table ()
    at ../../../cpukit/score/cpu/riscv/riscv-exception-handler.S:67
67		addi	sp, sp, -CPU_INTERRUPT_FRAME_SIZE
(gdb) p /x $mcause
$1 = 0x1
(gdb) p /x $mepc
$2 = 0x0
(gdb) bt
#0  _RISCV_Vector_table ()
    at ../../../cpukit/score/cpu/riscv/riscv-exception-handler.S:67
[...]
#10 bsp_fatal (code=RISCV_FATAL_NO_CLINT_REG_IN_DEVICE_TREE)
    at ../../../bsps/include/bsp/fatal.h:242
#11 riscv_clint_init (fdt=0x80011478 <bsp_fdt_blob>)
    at ../../../bsps/riscv/riscv/irq/irq.c:257
[...]
```

## Steps to reproduce

Build and run rv32.

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