Merge "Remove dividers of ActionButtonsPreference" into sc-dev am: bf3a8b54de am: 4e1a63fb81 am: 0f32cf78e2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/14753635

Change-Id: Ibec72ecfc95c3641459a004751f37cdb9c95b72f