Merge changes from topic "mt8188" into integration

* changes:
  feat(mt8188): add pinctrl support
  feat(mt8188): add RTC support
  feat(mt8188): add pmic and pwrap support
  refator(mediatek): move pmic.[c|h] to common folder
  refator(mediatek): move common definitions of pmic wrap to common folder
  feat(mt8188): add IOMMU enable control in SiP service
  feat(mt8188): add display port control in SiP service
  fix(mediatek): use uppercase for definition
  feat(mediatek): move dp drivers to common folder
  feat(mediatek): move mtk_cirq.c drivers to cirq folder
  feat(mt8188): initialize GIC
  feat(mt8188): initialize systimer
  feat(mt8188): initialize platform for MediaTek MT8188
  refator(mediatek): remove unused files
  refator(mediatek): move drivers folder in common to plat/mediatek
  feat(mediatek): support coreboot BL31 loading