Prune unavailable complications.

This changelist checks the availability of a complication based on its required available complication types and trims ineligible complications from participating at the LiveData level. By default, the DreamOverlayStateController now only returns available complications.

Bug: 214039870
Test: atest DreamOverlayStateControllerTest ComplicationCollectionLiveDataTest

Change-Id: If1fa63b46e409dce944b6e0ae54d80c2c44f7024