Make build_image output consistent for partitions w/o build.prop

  d["build.prop"] = d["system.build.prop"]

  if d.get("avb_enable") == "true":

    build_info = BuildInfo(d, use_legacy_id=True)

    # Set up the salt for partitions without build.prop

    if build_info.fingerprint:

      if "fingerprint" not in d:

        d["fingerprint"] = build_info.fingerprint

      if "avb_salt" not in d:

        d["avb_salt"] = sha256(build_info.fingerprint.encode()).hexdigest()

    # Set the vbmeta digest if exists

    try:

      d["vbmeta_digest"] = read_helper("META/vbmeta_digest.txt").rstrip()