Remove BatteryStatsService.mStats lock dependancy from ActiveService

Also remove the BatteryStatsImpl.Uid.Pkg.Serv object from ServiceRecord.
BatteryStats will now be informed of service lifecycle changes with the
uid, package and class name of the service.

Fixes: 170499696
Test: builds + flashes
Test: atest MockingOomAdjusterTests
Change-Id: I2edc28c32163350aec8ffb4d188b7d8d23741cad