am aa3d37a1: am 5790d54a: am 59f4ff10: Add verity_signer and verity_key flags to add_img_to_target_files.

* commit 'aa3d37a1d704ab9204de7d76dca784c9b17bd2ee':
  Add verity_signer and verity_key flags to add_img_to_target_files.