[2/2] Settings: Add lockscreen ring battery setting

Change-Id: Ia07ecc1feedee71b8ea217c53244fdef9ff1bc18

Conflicts:
	res/values/custom_strings.xml
[1/2] Setting: Lockscreen maximized widgets

Settings part of maximizing lockscreen widgets

Modified from CM

PS2: fix whitespace and remove debug

Change-Id: I3d52b752415f48e5468db0804be5c2ff93a71e31
Lockscreen Interface inital push
moved widget prefs from Security Settings into new LockscreenInterface class