Add a new util to clear a property am: 02d2b9e4cc am: 8a5f9be346 am: 399fc2867f

Original change: https://android-review.googlesource.com/c/platform/build/blueprint/+/2854407

Change-Id: I333018b002664f7711965b2516c8231450477855
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>