Allow settings preference title to span over multiple lines.

- add singleLineTitle=false to SettingsPreference style, so that it will
not confined the title to a single line.
- remove the custom multi line title from DividerPreference and
MasterSwitchPreference.

Change-Id: I5a78d2cd6ac00c4482e252b0789fd2d265bd9adf
Fix: 34886787
Test: manual