Merge "[Device Config] Ensure every config has a default setting." into tm-dev am: 81d47257

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18619288



Change-Id: I370533c9c8f34d0380a055965732653874a9c6a5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>