fix AS1000/AS1000A support.  It turns out the that iobus depends on the CPU version (apecs:ev4::cia:ev5) and the irq hardware depends on the systype previously, only ev4 AS1000s and ev5 AS1000a's would have worked.
fix AS1000/AS1000A support.  It turns out the that iobus depends on the
CPU version (apecs:ev4::cia:ev5) and the irq hardware depends on the systype
previously, only ev4 AS1000s and ev5 AS1000a's would have worked.

tested by: wilko (in its -stable form)
noticed by: daniel

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