firewire: core: use context analysis annotations and lockdep checks for transactions lock

The transaction lock protects the list of pending transactions and the
transaction label.

Add context analysis annotations for the transaction lock. Compiler-based
context analysis has difficulty tracking the locking scope when the lock
is accessed through an indirect reference (e.g. t->card->lock), making
some functions difficult to annotate. Use lockdep assertions to cover
these cases.

Link: https://lore.kernel.org/r/20261011063146.497455-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

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