selinux: Workaround for devices with PR_SET_NO_NEW_PRIVS enforcement

PR_SET_NO_NEW_PRIVS blocks domain transitions from within app_process,
unless the new domain is bounded by the app's context. So we can't
switch to a domain that has perms not available to untrusted_app :(

This means any app can talk to the daemon, bypassing the su executable
client. That's not a good thing, and needs to be resolved.

Change-Id: I85b74f90b8737caaa193a0555b5262e7392519b2
Overlay for stats collection on cm.

Change-Id: I3ecec3507cd617a41ac2c37c5892f3e8ed0261f5