Settings: Lockscreen custom wallpaper (2/2)
Based on :
https://github.com/CyanogenMod/android_packages_apps_Settings/commit/3538a6691bdda46b436f1185c86e1bfb1af2c753

Change-Id: Ic0207568911eaac3499c74387e68d655b14ca99d
still wip

Change-Id: Id02c17818d3bf16a94fe1d75004eedd72ef51f8f