Merge changes from topics "mtk_cold_boot", "mtk_init_scheme",...

Merge changes from topics "mtk_cold_boot", "mtk_init_scheme", "smc_registration_use_case", "vendor_extend_pubsub_event" into integration

* changes:
  feat(mediatek): implement generic platform port
  refactor(mediatek): smc registration services
  feat(mediatek): introduce mtk init framework
  refactor(mediatek): partition MTK SiP SMC ID
  feat(mediatek): extend SiP vendor subscription events