[automerger skipped] Revert "Revert "[DO NOT MERGE] Support non-host targets for ATF"" am: f06dfa4c7a am: 2fbda50c9d -s ours am: f24fa9c918

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

Change-Id: Id60b30c442037d5412fc83e207476bbf593e7eda