common: board_f: cosmetic use __weak for leds

First of all this looks a lot better, but it also
prevents a gcc warning (W=1), that the weak function
has no previous prototype.

cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Jeroen Hofstee <jeroen@myspectrum.nl>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/include/status_led.h b/include/status_led.h
index 0eb91b8..b8aaaf7 100644
--- a/include/status_led.h
+++ b/include/status_led.h
@@ -272,19 +272,21 @@
 # include <asm/status_led.h>
 #endif
 
+#endif	/* CONFIG_STATUS_LED	*/
+
 /*
  * Coloured LEDs API
  */
 #ifndef	__ASSEMBLY__
-extern void	coloured_LED_init (void);
-extern void	red_led_on(void);
-extern void	red_led_off(void);
-extern void	green_led_on(void);
-extern void	green_led_off(void);
-extern void	yellow_led_on(void);
-extern void	yellow_led_off(void);
-extern void	blue_led_on(void);
-extern void	blue_led_off(void);
+void coloured_LED_init(void);
+void red_led_on(void);
+void red_led_off(void);
+void green_led_on(void);
+void green_led_off(void);
+void yellow_led_on(void);
+void yellow_led_off(void);
+void blue_led_on(void);
+void blue_led_off(void);
 #else
 	.extern LED_init
 	.extern red_led_on
@@ -297,6 +299,4 @@
 	.extern blue_led_off
 #endif
 
-#endif	/* CONFIG_STATUS_LED	*/
-
 #endif	/* _STATUS_LED_H_	*/