RTEMS | RISC-V/start.S: Lwfi label can be used when not defined (#5519)

[Matteo Concas (@matteo.concas)]

Matteo Concas created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5519



## Summary
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Some weeks ago I added logic to park CPU cores that did not match the boot hart ID when not using SMP:

```c
#ifndef RTEMS_SMP
	li	t3, RISCV_BOOT_HARTID
	bne	a0, t3, .Lwfi
#endif
```

Today I realized that `Lwfi` is only defined when SMP is used. In this case, the label is simply replaced by the start of the memory so the program will jump there.

The CPU is still parked as it cannot progress after the instruction but it will do unnecessary operations, perhaps `Lwfi` could be moved out of the `RTEMS_SMP` block so it can be used in both cases.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5519
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