Fix some build errors.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/drivers/serial/mcfuart.c b/drivers/serial/mcfuart.c
index bc7077d..88f3eb1 100644
--- a/drivers/serial/mcfuart.c
+++ b/drivers/serial/mcfuart.c
@@ -28,12 +28,14 @@
  */
 
 #include <common.h>
+
+#ifdef CONFIG_MCFUART
+
 #include <asm/immap.h>
 #include <asm/uart.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#ifdef CONFIG_MCFUART
 extern void uart_port_conf(void);
 
 int serial_init(void)