Settings: Materialize DSLV

Change-Id: I8efe75ee2b571136a7983b9a0b36090294650c80

Original commit
https://github.com/SlimRoms/packages_apps_Settings/commit/9be3360b19a144ff333d6b8633cd653eb409c223

The following are not included due to differences in source.

res/menu/privacy_guard_manager.xml
res/values/slim_strings.xml