Show setting for work profile lock screen notification

- Add work profile notification setting to security_lockscreen_setting
- Modify the preference controller to stop hardcode preference keys.

Merged-In: I779590e34c1eca2dab5b62dda473cfa4371fc064
Change-Id: I5966d82f6373b3bf784385423b87fb4d26aecf0e
Fix: 62051309
Fix: 62045663
Test: make RunSettingsRoboTests