Revert "Custom LockScreen Wallpaper (2/2)"

This reverts commit 8459c7ac6eedda3dcab4fbf301d7df5e4548f8f3.

Conflicts:
	res/values/bk_arrays.xml
	res/values/bk_strings.xml
	src/com/android/settings/slim/LockscreenStyle.java
Add missing mdpi, hdpi, xhdpi drawables for new theme engine

Change-Id: I70dd75257f0e3a0a20b844a1ea3cc36506de177b
Squash CM Keyguard Wallpaper changes