[automerger skipped] Revert "[DO NOT MERGE] Support non-host targets for ATF" am: cc5dc1e344 am: e175c29261 -s ours am: 4e2b934081 -s ours am: c2f9126fd7

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/misc/+/14824581

Change-Id: I40cea9820ce8dd57c3162ea8e3c3df74ff0248b5