soc: dove: Convert generic irqchip locking to guard()

Conversion was done with Coccinelle. No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/all/20250313142524.137040686@linutronix.de

drivers/soc/dove/pmu.c

@@ -257,10 +257,9 @@ static void pmu_irq_handler(struct irq_desc *desc)
 	 * So, let's structure the code so that the window is as small as
 	 * possible.
 	 */
-	irq_gc_lock(gc);
+	guard(raw_spinlock)(&gc->lock);
 	done &= readl_relaxed(base + PMC_IRQ_CAUSE);
 	writel_relaxed(done, base + PMC_IRQ_CAUSE);
-	irq_gc_unlock(gc);
 }
 
 static int __init dove_init_pmu_irq(struct pmu_data *pmu, int irq)