Remove CommandQueueCallbacks interface from StatusBar.

This is a big change, but relatively clean. It removes a lot of
noisy code from StatusBar and starts to reveal some of the places
that it should be split up in the future.

Bug: 190746471
Test: atest SystemUITests
Change-Id: Iba5afbe0fac42b96cdf02b5e859cc142e8038b7d
7 files changed