In IEEE 1394, all devices on the bus are required to provide structured data in response to requests to a specific range of their address space. This structured data is called configuration ROM and is defined in IEEE 1212. The core function of this subsystem contains the generator and parser for the configuration ROM. The generator constructs the configuration ROM for the local host node, while the parser interprets the configuration ROM of detected nodes. Both the generator and parser are fundamental to identifying the node capabilities. Add KUnit test skeletons for testing their implementations. Link: https://lore.kernel.org/r/20260901134534.2386577-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>