Refactor common dream complication attributes in style.

Common dream complication view attributes had been defined in multiple places, e.g. clock subtitle widgets all have the same font size but were defined many times in multiple places. Refactored to a single place such that other similar complication entries such as AQI could be added using the same style.

Bug: 224784347
Test: manual
Change-Id: Id1efa1a7ea3add90a1721602a42a2fab367f9ffe