Merge "Add option to use protobuf3" am: b611cf42

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2555031



Change-Id: I9f4a6a45df82dba9ed42d0f31921e2e46b68e9cd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>