All callers of this function now always pass the same values, so this
change hardcodes those values within the function body.
Fix: 145008064
Test: python -m unittest test_common
Test: build & boot a merged target that uses DAP
Change-Id: I0051c5ba507983231825edfcaf349e574efa451a
Bug: 137853921
Bug: 138671115
Test: python -m unittest test_common
Test: python -m unittest test_add_img_to_target_files
Test: Ran 'merge_builds --build_vbmeta' for two devices, one with the
vbmeta struct on system.img and another with vbmeta_system.img. Flashed
the regenerated vbmeta.img files on devices, devices boot.
Change-Id: I8d7585c7af468be3d242d8aceeed6d27e6fc6d96