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In the protocol of IEEE 1394, phy configuration packet is broadcasted to the bus to configure all PHYs residing on the bus. It includes two purposes; selecting root node and optimizing gap count. This commit adds some helper function to serialize/deserialize the content of phy configuration packet, as well as some KUnit tests for it. Link: https://lore.kernel.org/r/20240606235133.231543-2-o-takashi@sakamocchi.jp Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>