Wrap all state changes that can affect OomAdjuster computation

The new ProcessStateController will be responsible for handling all
state changes that can affect OomAdjuster computation. This CL is the
first step of several and just does a benign replacements of all state
changes with a call into ProcessStateController.

Flag: EXEMPTED refactor
Bug: 346822474
Test: atest MockingOomAdjusterTests
Change-Id: Iefc05dd5996c86eab362e73054821702aa87e927