Move Wakelock acquisition and release logic to WakeLockController

This is to decouple the dependency of DisplayPowerController from
suspend blockers lifecycle. We do not expect any behavioural changes in
the functioning of a device post this.

Bug: 245920251
Test: atest WakelockControllerTest
Test: Manual with DisplayPowerController2
Change-Id: I115a31a0557e44d1cbe70362c6dd2b315ef1241d