Clean up info and callback architecture in KeyguardUpdateMonitor.

- We now pass a more robust battery status object to methods that handle battery updates.
- Consolidated battery decision code into BatteryStatus object (e.g.  charging, low, charged)
so it can be shared.
- Consolidated SIMStateCallback into common KeyguardUpdateMonitorCallback object to reduce complexity.
- Consolidated user changes into common callback using KeyguardUpdateMonitorCallback.
- Fixed a race condition caused by launching LockSettingsService after WindowManagerService.

Change-Id: I6b2a328f8581f35593e41348693b92ab66d02429