Add MBOX_DRIVER_HEARTBEAT/MBOX_FW_HEARTBEAT/FC4_FC_SVC defines.
Add MBOX_DRIVER_HEARTBEAT/MBOX_FW_HEARTBEAT/FC4_FC_SVC defines.

MFC after:	1 week

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