Merge "Remove unused onboardingPrefs" into udc-qpr-dev am: 7aaee510db am: afa6c0ff0b

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23681105

Change-Id: I3e13fc7cfea414e5ecd288fd20d36ec5fe7b723d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>