superuser : missing permissions for superuser with strict selinux

This stuff is missing.
based on this commit
http://review.cyanogenmod.org/#/c/80814/1/sepolicy/untrusted_app.te

That was postet to device/oppo/msm8974-common but
this is needed for every device so we better put it into the right position
(will most likely come to cm also later)

Change-Id: I15b66f1089e5cda7ee6fe07e194ee446086aed37