Remove obsolete ttya/ttyb entries and replace with ttyy0/1. Mark origin of ofw_console(4) and zs(4) devices.
Remove obsolete ttya/ttyb entries and replace with ttyy0/1.
Mark origin of ofw_console(4) and zs(4) devices.

MFC after:  3 days

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