mfd: pm8921: Drop irq_set_lockdep_class() code

This isn't necessary as we aren't setting the summary interrupt
to wake up the system in the irq_wake() callback.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/pm8921-core.c

@@ -310,14 +310,11 @@ static int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
 	return rc;
 }
 
-static struct lock_class_key pm8xxx_irq_lock_class;
-
 static int pm8xxx_irq_domain_map(struct irq_domain *d, unsigned int irq,
 				   irq_hw_number_t hwirq)
 {
 	struct pm_irq_chip *chip = d->host_data;
 
-	irq_set_lockdep_class(irq, &pm8xxx_irq_lock_class);
 	irq_set_chip_and_handler(irq, &pm8xxx_irq_chip, handle_level_irq);
 	irq_set_chip_data(irq, chip);
 #ifdef CONFIG_ARM