Merge changes from topic "xlnx_tfa_passthrough_plm_ipi_cmd" into integration

* changes:
  docs(xilinx): update SMC documentation in TF-A
  feat(xilinx): add feature check function for TF-A specific APIs
  feat(xilinx): update SiP SVC version number
  feat(xilinx): update TF-A to passthrough all PLM commands
  fix(xilinx): fix logic to read ipi response