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 am: 815ec732

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

Change-Id: I220d916f21d74361258e2d68425bb85f3b2b2032