Push Broadcast related state to ProcessStateController

Also delete the current receiver ref counting and deprecated current
receiver tracking.
OomAdjuster and ActivityManagerService only really care whether a
receiver is running or not for a given process, so a boolean state
should be enough.

Flag: com.android.server.am.push_broadcast_state_to_oomadjuster
Fixes: 401350498
Test: atest MockingOomAdjusterTests
Test: atest BroadcastQueueTest
Change-Id: Ie89c0567064800bd7707c316a35b44daf68b7636