[2/2] Settings: Lockscreen Notifications

PS6:
    [2/2] Lockscreen Notifications: make offset top user configurable & add privacy mode

PS7:
    Fix Derp

Change-Id: Ic66c0ff9d36bc390f5a434559468fe3752faf285

Conflicts:
	AndroidManifest.xml
	res/values/custom_strings.xml
	res/xml/security_settings_biometric_weak.xml
	res/xml/security_settings_chooser_disabled_lockscreen.xml
	res/xml/security_settings_password.xml
	res/xml/security_settings_pattern.xml
	res/xml/security_settings_pin.xml