Merge "Update System settings content observer to cache values." into sc-dev am: 4d6b0270ab

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13556230

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I8f94656817f2eebf2a86e28ade9c0be62ea0a3ef