lockdep: Remove disable_irq_lockdep()

disable_irq_lockdep() has no users, last one was probabaly removed in
   0b7c8743 ("forcedeth: fix unilateral interrupt disabling in netpoll path")

Remove disable_irq_lockdep().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20250212103619.2560503-3-bigeasy@linutronix.de