RTEMS | bsp/aarch64:Fix _CPU_SMP_Get_current_processor() (!229)

[xiaojun zheng (@zhengxiaojun)]

xiaojun zheng created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/229

Project:Branches: zhengxiaojun/rtems:update_Per_CPU_Get_index to rtems/rtos/rtems:main
Author:   xiaojun zheng




## Summary

bsp/aarch64:Fix _CPU_SMP_Get_current_processor()

  Fix _CPU_SMP_Get_current_processor(), since read from register MPIDR_EL1
(the least significant byte) is not always right,for example the least
significant byte of MPIDR_EL1 is always zero for cortex-a55.
  aarch64 has a thread ID register TPIDR_EL1 available for for OS management
purposes. RTEMS stores per-CPU control in TPIDR_EL1 when the core startup,
so we can use _Per_CPU_Get_index() to get current processor index.

update #5064


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/229
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