Merge "Revert "Enable mainline prebuilts on tm-dev branch."" into tm-dev am: 525d7a8a

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/18516629



Change-Id: Icdcb888bbea6e7356daf457045074833264a6064
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>