irqchip/jcore-aic: Fix non static symbol warning

Fixes the following sparse warning:

drivers/irqchip/irq-jcore-aic.c:47:12: warning:
 symbol 'aic_irq_of_init' was not declared. Should it be static?
Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com>
Link: https://lkml.kernel.org/r/1471706788-27587-1-git-send-email-weiyj.lk@gmail.comSigned-off-by: Jason Cooper <jason@lakedaemon.net>

drivers/irqchip/irq-jcore-aic.c

@@ -44,7 +44,8 @@ static void noop(struct irq_data *data)
 {
 }
 
-int __init aic_irq_of_init(struct device_node *node, struct device_node *parent)
+static int __init aic_irq_of_init(struct device_node *node,
+				  struct device_node *parent)
 {
 	unsigned min_irq = JCORE_AIC2_MIN_HWIRQ;
 	unsigned dom_sz = JCORE_AIC_MAX_HWIRQ+1;