firewire: core: add KUnit tests for successful tree building

After a bus reset, self ID sequence is captured by 1394 OHCI hardware and
passed to software through SelfID DMA context. The core parses the sequence
to build an internal cache of the node tree for the current generation
of the bus. This is the first step in managing resources on the bus.

The tree is build by the build_tree() function. This commit adds KUnit
tests for the function, covering several successful scenarios.

Link: https://lore.kernel.org/r/20260810064119.410324-3-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

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