Update notes for submitted changes

* Add wallpaper pickers to seperate package [1/2]
* frameworks: move keyguard wallpaper to system  (1/2)
* Style previews [1/3]
* Keyguard : Fix album art sticking after playback is stopped
* Lockscreen wallpaper for themes
* Keyguard: more consistency with the new lockscreen wallpaper
* Lockscreen: Fix SystemUI crash on initial selection of Custom Background.
* Frameworks: Lockscreen custom wallpaper (1/2)
* Revert "add lockscreen wallpaper (2/2)"
* Revert "Fixed retrieving non-initialized wallpaper information"