irqchip/apple-aic: Mark aic_init_smp() as __init

This function is only called from the driver init code.
Signed-off-by: NDonghyeok Kim <dthex5d@gmail.com>
Acked-by: NHector Martin <marcan@marcan.st>
Signed-off-by: NMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20211204164228.5920-1-dthex5d@gmail.com

drivers/irqchip/irq-apple-aic.c

@@ -707,7 +707,7 @@ static const struct irq_domain_ops aic_ipi_domain_ops = {
 	.free = aic_ipi_free,
 };
 
-static int aic_init_smp(struct aic_irq_chip *irqc, struct device_node *node)
+static int __init aic_init_smp(struct aic_irq_chip *irqc, struct device_node *node)
 {
 	struct irq_domain *ipi_domain;
 	int base_ipi;