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

Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c
index c59e188..b7f4b59 100644
--- a/arch/arm/mach-exynos/common.c
+++ b/arch/arm/mach-exynos/common.c
@@ -673,7 +673,7 @@
 	chained_irq_exit(chip, desc);
 }
 
-int __init exynos4_init_irq_eint(void)
+static int __init exynos4_init_irq_eint(void)
 {
 	int irq;