Merge changes from topics "rddaniel", "rdn1edge_dual" into integration

Merge changes from topics "rddaniel", "rdn1edge_dual" into integration

* changes:
  plat/arm: add board support for rd-daniel platform
  plat/arm/sgi: move GIC related constants to board files
  platform/arm/sgi: add multi-chip mode parameter in HW_CONFIG dts
  board/rdn1edge: add support for dual-chip configuration
  drivers/arm/scmi: allow use of multiple SCMI channels
  drivers/mhu: derive doorbell base address
  plat/arm/sgi: include AFF3 affinity in core position calculation
  plat/arm/sgi: add macros for remote chip device region
  plat/arm/sgi: add chip_id and multi_chip_mode to platform variant info
  plat/arm/sgi: move bl31_platform_setup to board file