Merge changes Ie7c0eaf2,I11d882f3,I3f173ac4,If1fa12bf,I3e3a202f, ... into integration

* changes:
  feat(plat/rcar3): keep RWDT enabled
  feat(drivers/rcar3): add extra offset if booting B-side
  feat(plat/rcar3): modify LifeC register setting for R-Car D3
  feat(plat/rcar3): modify SWDT counter setting for R-Car D3
  feat(plat/rcar3): update DDR setting for R-Car D3
  feat(plat/rcar3): remove access to RMSTPCRn registers in R-Car D3
  feat(plat/rcar3): add process of SSCG setting for R-Car D3
  feat(plat/rcar3): add process to back up X6 and X7 register's value
  feat(plat/rcar3): modify operation register from SYSCISR to SYSCISCR
  feat(plat/rcar3): add SYSCEXTMASK bit set/clear in scu_power_up
  feat(plat/rcar3): change the memory map for OP-TEE
  feat(plat/rcar3): use PRR cut to determine DRAM size on M3
  feat(plat/rcar3): apply ERRATA_A53_1530924 and ERRATA_A57_1319537
  fix(plat/rcar3): fix disabling MFIS write protection for R-Car D3
  fix(plat/rcar3): fix eMMC boot support for R-Car D3
  fix(plat/rcar3): fix version judgment for R-Car D3
  fix(plat/rcar3): fix source file to make about GICv2
  fix(drivers/rcar3): console: fix a return value of console_rcar_init