Revert "Lockscreen Blur (1/2)"

This reverts commit 49e9660ca224d2547b3d7ae43c4200ee2d737c12.

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java
	services/java/com/android/server/power/DisplayPowerController.java