Fix the ofw_isa.c entries, readd ofw_bus.c.
Fix the ofw_isa.c entries, readd ofw_bus.c.

Pointy hat to:	tmm

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