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: 464e12f1

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

Change-Id: I990cf2dfd928f8d1c4a338ab69ce274f2256dbf2