Merge "Use protobuf 2.x instead of 3.x" into tm-qpr-dev-plus-aosp am: 76fcbfbb

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/22324319



Change-Id: I93269904fed645e9e56e758b86df21a1baa4e3fd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>