Add stub entry point implementations of mpo_priv_check and mpo_priv_grant to the mac_stub policy.
Add stub entry point implementations of mpo_priv_check and mpo_priv_grant to
the mac_stub policy.

Obtained from:	TrustedBSD Project

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase