RTEMS | bsps/sparc/leon3: Fix GPTIMER timer index logic (!514)

[Matteo Concas (@matteo.concas)]

Matteo Concas created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/514

Project:Branches: matteo.concas/rtems-gaisler:matteo/fix-mp-leon3 to rtems/rtos/rtems:main
Author:   Matteo Concas




## Summary

bsps/sparc/leon3: Fix GPTIMER timer index logic

The old logic would lead to an error when multiprocessing was enabled and `LEON3_GPTIMER_BASE` was defined due to `leon3_timer_core_index` being undefined.

The new logic fixes this and keeps the same intent:
 - If multiprocessing is not enabled, the timer index is 0
 - If multiprocessing is enabled and `LEON3_GPTIMER_BASE` is defined, the timer index is twice the CPU boot index
 - If multiprocessing is enabled and `LEON3_GPTIMER_BASE` is not defined, we fallback to the old logic using the GPTIMER core index.

 Close #5258


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