Revert "add Custom Lockscreen switch"

This reverts commit a72faeb7560699107e317b3d6bfaede00c65b851.
Revert "Lockscreen: Fix SystemUI crash on initial selection of Custom Background."

This reverts commit 9bbadb1b32de1203acb319c6c8178737ba61fc6f.
Revert "Frameworks: Lockscreen custom wallpaper (1/2)"

This reverts commit c39c8c36bae7a65ddfc9bf7f4200461fecc586c6.