[automerger skipped] Revert "Revert "[DO NOT MERGE] Support non-host targets for ATF"" am: f06dfa4c7a am: 2fbda50c9d -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/misc/+/14825131

Change-Id: I148eb7ea15bab8c10b5edc31da0285716f03eb2b