add sepolicy entry for lockscreen wallpaper

Change-Id: Ie779392ab8118d192873a01ec5c7de3e5938ed17
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	sepolicy/file_contexts
Add Bulsatcom APN

Change-Id: Iedde9248dae63ce5ad030c7713192f0a64f1d038
(cherry picked from commit 12e4e186cb111adcaf628fae0c6471fd22770470)