Merge changes from topic "gpt_updates" into integration

* changes:
  refactor(arm): use gpt_partition_init
  feat(partition): add interface to init gpt
  refactor(partition): convert warn to verbose
  feat(partition): add support to use backup GPT header
  refactor(partition): get GPT header location from MBR
  feat(arm): add IO policy to use backup gpt header
  feat(tbbr): add image id for backup GPT