Remove power widget background

Change-Id: I314642782525fc441a651cc2b48b227f663dfeed
Framework: Quick Settings customization (Part 2 of 2) WIP!

This commit will alow loading the Quick Settings tiles layout from
a layout that is configured in Settings.

Patchset 3 - Restore Settings tile to AOSP location

Signed-off-by: Paul Beeler <sparksco@gmail.com>