MFC: r200925
MFC: r200925

- By re-arranging the code in OF_decode_addr() somewhat and accepting
  a bit of a detour we can just iterate through the banks array instead
  of having to calculate every offset. This change is inspired by the
  powerpc version of this function.
- Add support for the JBus to EBus bridges which hang off of nexus(4).

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