Update media visibility on lock screen

Media carousel visibility on lock screen follows the notification
setting - if notifications are disabled on lock screen, hide media carousel
everywhere, not just in the keyguard layout

Bug: 314333719
Test: manual
Test: atest MediaHierarchyManagerTest
Flag: NONE
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:007313b88e830ab9f0a8119406a61c89ca412fb5)
Merged-In: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9
Change-Id: I4f618e4013db894291e6fca9d49bceb1cb7e4bd9