RTEMS | bsps/raspberrypi5: Add SMP support (!1072)

[Preetam Das (@lostux)]

Preetam Das started a new discussion on bsps/shared/start/bspsmp-arm-psci.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1072#note_143396

 >  #if defined( AARCH64_MULTILIB_ARCH_V8 ) || \
 >    defined( AARCH64_MULTILIB_ARCH_V8_ILP32 )
 >    uint32_t PSCI_FN_SYSTEM_CPU_ON = 0xC4000003;
 > -  uint64_t target_cpu = _AArch64_Read_mpidr_el1();
 > +  uint64_t target_cpu = _AArch64_Get_MPIDR_for_cpu_index( cpu_index );
 > +  target_cpu &= ( 0x00ff00ffffffULL );
 >    uint64_t ret;
 >  #else
 >    uint32_t PSCI_FN_SYSTEM_CPU_ON = 0x84000003;
 > -  uint32_t target_cpu = _AArch32_Read_mpidr();
 > +  uint32_t target_cpu = _ARM_Get_MPIDR_for_cpu_index( cpu_index );
 > +  target_cpu &= ( 0x00ffffffUL );

The `target_cpu` parameter should only reflect the affinity fields of the MPIDR registers. So I added these flags to zero out the remaining bits.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1072#note_143396
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