Revert "Lockscreen Blur (1/2)"

This reverts commit 6dd31e6b8aa343e1af7ec5f02b9bcf3c736818bd.

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