Remove the concept of "early mutator". am: 83a5a308b1 am: 85011ed22a

Original change: https://android-review.googlesource.com/c/platform/build/blueprint/+/2067144

Change-Id: I3f1ee5e004ba71d5ded49f471b7ed1e883e5d36b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>