Revert "Custom Wallpaper: use PNG and fix derp"

This reverts commit bf98d1bea8d8c7c83531a4f0b08c21a696ce78d7.
Revert "Custom lockscreen wallpaper [1/2]"

This reverts commit 564b642857ac467d98cc2cc2ec480182e324b5c0.

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