[automerger skipped] Retry: Enable mainline prebuilts on tm-dev branch. am: c7b5e2c0 -s ours

am skip reason: Merged-In I9731400acfade95b3eab8f2d99fddb4cf856aa91 with SHA-1 4a71082e is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/18557348



Change-Id: Ia095dfa745624d5c96fb18754e1a61c4cf4dcc89
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>