Keyboard light: Fix the physical keyboard not light when it's visiable.

Change-Id: I595afd3cb6b422a17ae0f6ec20aa51979db13810

Conflicts:
	services/java/com/android/server/power/PowerManagerService.java

Conflicts:
	core/java/android/os/IPowerManager.aidl
	core/java/android/os/PowerManager.java
	services/java/com/android/server/power/PowerManagerService.java
	tools/layoutlib/bridge/src/com/android/layoutlib/bridge/android/BridgePowerManager.java