DO NOT MERGE

Update battery manager toggle to support on / off summary.

Screenshots attached to the bug.

Bug: 148847755
Test: Visual - on blueline aosp build / boot / check settings pages
Test: Visual - on blueline eng build / boot / check settings pages
Change-Id: I44b1c74baf4bafa549519d4f20fa470389cd5e0b
(cherry picked from commit 1a289bde)