RTEMS | aarch64: Generalize PSCI support (!1157)

[Preetam Das (@lostux)]

Preetam Das commented on a discussion on cpukit/score/cpu/aarch64/include/rtems/score/cpuimpl.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1157#note_146842

 >   */
 >  uint64_t _AArch64_Get_current_processor_for_system_start( void );
 >  
 > +/**
 > + * @brief Returns the PSCI target_cpu parameter for a given CPU index.
 > + *
 > + * This function is provided by the BSP.  The default implementation assumes the
 > + * core IDs to be in affinity level 0. BSPs that do not follow this convention
 > + * can override this function to use the correct affinity level for the target_cpu
 > + * calculation.
 > + */
 > +uintptr_t _AArch64_Get_PSCI_target_cpu( uint32_t );

Currently, we don't have any `aarch32` BSPs that use PSCI, but if such BSP is added in the future this change will break the build.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1157#note_146842
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