Extreme battery saver: AlarmManager

- AlarmManagerService now uses ForceAppStandbyTracker.

- Now AlarmManagerService uses the system + user power-save whitelist,
rather than just the user whitelist.

Test: Manual test
Test: atest frameworks/base/services/tests/servicestests/src/com/android/server/ForceAppStandbyTrackerTest.java
Bug 68769804

Change-Id: Ie2bd17fe0c3cb8b09ec4c4a78f9254277be16926