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

src/com/android/settings/notification/AppNotificationSettings.java

@@ -165,7 +165,6 @@ public class AppNotificationSettings extends NotificationSettingsBase {
                     channelPref.setKey(channel.getId());
                     channelPref.setTitle(channel.getName());
                     channelPref.setChecked(channel.getImportance() != IMPORTANCE_NONE);
-                    channelPref.setMultiLine(true);
                     channelPref.setSummary(getImportanceSummary(channel.getImportance()));
                     Bundle channelArgs = new Bundle();
                     channelArgs.putInt(AppInfoBase.ARG_PACKAGE_UID, mUid);