ARM: SAMSUNG: 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/plat-s5p/irq-eint.c b/arch/arm/plat-s5p/irq-eint.c
index c496b35..139c050 100644
--- a/arch/arm/plat-s5p/irq-eint.c
+++ b/arch/arm/plat-s5p/irq-eint.c
@@ -200,7 +200,7 @@
 #endif
 };
 
-int __init s5p_init_irq_eint(void)
+static int __init s5p_init_irq_eint(void)
 {
 	int irq;