Merge changes from topic "srm/Errata_ABI_El3-lts-v2.8" into lts-v2.8

* changes:
  docs(errata_abi): document the errata abi changes
  feat(fvp): enable errata management interface
  fix(cpus): workaround platforms non-arm interconnect
  refactor(errata_abi): factor in non-arm interconnect
  feat(errata_abi): errata management firmware interface
  feat(build): add support for new binutils versions
  build(makefile): add helper to detect linker options
  fix(build): allow warnings when using lld