Add a new setting that controls whether media on lock screen is enabled,
disregarding the notifications status. The new setting is available
under media and privacy settings.
Bug: 229915240
Test: atest MediaControlsLockScreenPreferenceControllerTest
Change-Id: I054f36efd635dc0535551d3058f9faf92196349d
Safety Center is enabled, the existing "Privacy" screen will be
different in a few ways:
1. Its title will become "More privacy settings"
2. A few preferences will be hidden
3. A few preferences will be reworded
4. The ordering of a few preferences will change
5. The PRIVACY_SETTINGS intent will now point to Safety Center;
PRIVACY_ADVANCED_SETTINGS will point to "More privacy settings".
Test: manual
Bug: 222127397
Change-Id: I74faf770babb34f775b2ef572248e550ea683ab3
