Revert "Frameworks: Lockscreen custom wallpaper (1/2)"

This reverts commit 032650221f8f164b4c5f43d8488e569294faa0fc.

Conflicts:
	core/java/android/provider/Settings.java
	packages/Keyguard/src/com/android/keyguard/KeyguardViewManager.java

Change-Id: I4d2a6d9771d9df38adcdb074adf55f4690804cb1