Merge "Add One-handed mode entry point in a11y system controls" into sc-dev...

Merge "Add One-handed mode entry point in a11y system controls" into sc-dev am: 1da2a539 am: 1f0a69cd

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/14980884

Change-Id: If9b9161efd6e49f0c980c6e54fee70c99133a58c