Use KeyguardVisibilityHelper for CommunalHostView.

This changelist uses KeyguardVisibilityHelper for
CommunalHostView by allowing KeyguardVisibilityHelper
clients to specify at construction that they would
like to be shown on communal.

Test: atest KeyguardVisibilityHelperTest#testVisibleOnCommunal
Bug: 197022459
Change-Id: Idb2c83a8441305a130e2d7e13220410f88a0102e