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: I59779eb59d217f14484b1674c982ff072e3be21d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>