firewire: core: use appropriate spinlock variants for transaction-related locks

The spinlocks in the fw_card structure protect transaction-related state
from concurrent access. They are acquired mostly from process context.
The exceptions are split_transaction_timeout_callback(), which runs in
softirq context for the timer wheel, and __fw_send_request(), which may
also be called from interrupt context.

Use spin_lock() in split_transaction_timeout_callback() and
spin_lock_irqsave() in the other functions. The latter preserves and
restores the caller's interrupt state, as the callers are not guaranteed
to have interrupts enabled.

Link: https://lore.kernel.org/r/20261012015739.530731-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

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