lockdep: Remove disable_irq_lockdep()

disable_irq_lockdep() has no users, last one was probabaly removed in
   0b7c874 ("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

include/linux/interrupt.h

@@ -461,14 +461,6 @@ static inline void disable_irq_nosync_lockdep_irqsave(unsigned int irq, unsigned
 #endif
 }
 
-static inline void disable_irq_lockdep(unsigned int irq)
-{
-	disable_irq(irq);
-#ifdef CONFIG_LOCKDEP
-	local_irq_disable();
-#endif
-}
-
 static inline void enable_irq_lockdep(unsigned int irq)
 {
 #if defined(CONFIG_LOCKDEP) && !defined(CONFIG_PREEMPT_RT)