Combine battery trackers.

Combine the separate Controller battery/charging trackers into one so
that JobScheduler only has to receive the battery change broadcasts once
to update all of the state. This also makes testing easier since the
test can be sure that once the battery sequence is updated, all of JS
has processed the battery state change.

Bug: 141645789
Bug: 213277873
Test: atest --rerun-until-failure 25 CtsJobSchedulerTestCases:android.jobscheduler.cts.JobThrottlingTest#testRestrictingStopReason_Quota
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/job
Test: atest frameworks/base/services/tests/mockingservicestests/src/com/android/server/job
Test: atest CtsJobSchedulerTestCases
Change-Id: I7151798f17c177eb5e86a6ec51c2d545768a4fcd