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

Merge "[Device Config] Ensure every config has a default setting." into tm-dev am: 81d47257 am: bf585f48 am: 8dee60a6 am: abba26e3

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



Change-Id: Ib5b5069999a408e04826eff8b1ddc578dafc3e29
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>