Normalize the axi bridge

[zwabbit]

Right now changes to the register space for the AXI interface requires repackaging of the IP core. This really should not be necessary and is a pain to redo. As such I am going to create a pass through axi interconnect that breaks out all of the AXI related ports. This should make the entire thing generate once and all further changes will be done in the actual neko project instead of the IP core.