Revert "Enable mainline prebuilts on tm-dev branch."

This reverts commit de9f0b12.

Reason for revert: breaks build_test and build_test2 on git_tm-dev.

Reverting the topic together does not work due to limitations with TH. However, this is the change that caused the error, the other changes were just fixing issues unrelated to this specific problem.

Bug: 233412962
Bug: 230478310
Bug: 223592962
Change-Id: I4d4de4f4c63c9c34fb083edbe76b09852af357e4
Test: presubmit