Merge changes from topic "tf-cleanup" into integration

* changes:
  plat/arm: Move fconf population after the enablement of MMU
  lib/fconf: Update 'set_fw_config_info' function
  lib/fconf: Update data type of config max size
  plat/arm: Check the need for firmware update only once
  plat/arm: sgm: Use consistent name for tb fw config node