[automerger skipped] Enable mainline prebuilts on tm-dev branch. am:...

[automerger skipped] Enable mainline prebuilts on tm-dev branch. am: de9f0b12 am: 0ff1d72d -s ours am: 209a2ebc -s ours

am skip reason: Merged-In I3ed091156c4b39dad6eaf578144ac3d070025988 with SHA-1 03e32400 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/build/+/18467382



Change-Id: I88afc8536b87d0ef3184804ee2d122a876f9d620
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>