New iob_soc.py passes attributes to parent core (iob_system) via python parameters.
This allows iob_system scripts to automate features from iob_soc attributes (like peripheral cbus connections).
Replace iob_system is_peripheral attribute by peripheral_addr_w.
iob_soc.pypasses attributes to parent core (iob_system) via python parameters. This allows iob_system scripts to automate features from iob_soc attributes (like peripheral cbus connections).is_peripheralattribute byperipheral_addr_w.