Enforce a secondary label on tiles

If a tile does not show a secondary label and is either UNAVAILABLE or
has a BooleanState, show a secondary label describing the state.

This affects both systemui tiles as well as TileServices.

Test: manual
Test: QSTileBaseViewTest
Bug: 181789479
Change-Id: I2253245e71ef527237a503f1bd9696669fabc558