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

[automerger skipped] Revert "Enable mainline prebuilts on tm-dev branch." am: dddc036b -s ours am: d83e41d6 -s ours am: 34ae6d84 -s ours am: 69874cf7 -s ours

am skip reason: Merged-In I3ed091156c4b39dad6eaf578144ac3d070025988 with SHA-1 03e32400 is already in history. Merged-In was found from reverted change.

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



Change-Id: I7580342aec4d22395f05e7a401cdd1fe86608ba6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>