Push Activity related state to ProcessStateController

Activity state is controlled under the WindowManagerService lock and it
is preferable to avoid introducing the ActivityManagerService lock to
WindowManagerService flows. ProcessStateController provides a suite of
async calls that will offload the AMS locked work to the DisplayThread.

Flag: com.android.server.am.push_activity_state_to_oomadjuster
Fixes: 401350380
Fixes: 302575389
Test: atest MockingOomAdjusterTests

Change-Id: I55abedec63be43f6ec67c82022d03c0fcf416d8f