Config notifs page updates

- Remove unused settings
- Regroup and combine lockscreen settings. The original
lockscreen controller is used in other places (SUW and privacy)
and so it's left untouched for those uses for now.

Test: atest
Bug: 132971502
Change-Id: Ic82817ff98cab27ca35b9488ae2e0eb6922a18e8
9 files changed