Add ViewController to CarrierText.

Rename CarrierTextController to CarrierTextManager to avoid confusion.

Removes several calls to Dependency.get(). This was the primary
impetus for this change.

Bug: 179775696
Test: atest SystemUITests
Change-Id: I6d027169247e8b93fe979e54c04a61bbacb4cca5
14 files changed