Update media carousel visibility for glanceable hub.

This changelist accounts for the glanceable hub presence for determining
whether the media carousel is visible. The visibility state is
responsible for ensuring the carousel is properly configured when shown.

Test: atest testCommunalLocationVisibilityWithShadeShowing
Test: atest testCommunalLocationVisibilityWithPrimaryBouncerShowing
Flag: EXEMPT bugfix
Fixes: 364488347
Change-Id: I97a8e70bcdb68a8740eab15df2cb14f5a94b15f6