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: I332d23f0727ec314bd116e6aae7eeb7d234f7fd7