ARM: EXYNOS: use static declaration when it is not used in other files

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/mach-exynos/common.c

@@ -673,7 +673,7 @@ static void exynos4_irq_eint0_15(unsigned int irq, struct irq_desc *desc)
 	chained_irq_exit(chip, desc);
 }
 
-int __init exynos4_init_irq_eint(void)
+static int __init exynos4_init_irq_eint(void)
 {
 	int irq;