S5P: serial: Use the inline function instead of static value

Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/include/asm/arch-s5pc1xx/uart.h b/arch/arm/include/asm/arch-s5pc1xx/uart.h
index f6eeab4..1c56739 100644
--- a/arch/arm/include/asm/arch-s5pc1xx/uart.h
+++ b/arch/arm/include/asm/arch-s5pc1xx/uart.h
@@ -48,7 +48,10 @@
 	unsigned char	res3[0x3d0];
 };
 
-static int use_divslot = 1;
+static inline int s5p_uart_divslot(void)
+{
+	return 1;
+}
 
 #endif	/* __ASSEMBLY__ */