Remove the concept of "early mutator". am: 83a5a308b1 am: 85011ed22a am: 24a8eb0e51

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

Change-Id: I06e5296e3748fb6e1cc84d267b22d12e96b45a50
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>