Change custom image background on notif panel.

 * using Intent.createChooser to create a custom chooser.

Signed-off-by: baked <travp624@gmail.com>
Settings: move keyguard wallpaper to system (2/2)

Change-Id: Id3bb66aa78c2e3dbd1170e74e33fcd160e5a70bb
Signed-off-by: Roman Birg <roman@cyngn.com>