Revert "Revert "priv_app: use per-app selinux contexts""

This reverts commit 2be0c80c572da736a7f284f0d1e5e1d3b0e8bd04.

Reason for revert: Could introduce DOA, b/190567190, tracking the P0 issue.

Change-Id: I0ac058d557424ffa259529e34819bf956afbadda
(cherry picked from commit 0a3bb36941d2259cebf3fcfdad11b27aa22550ff)
1 file changed