Blackfin: implement general support for CONFIG_STATUS_LED

Here are the Blackfin-specific and board-independent pieces for status leds.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/include/status_led.h b/include/status_led.h
index 79be698..175972a 100644
--- a/include/status_led.h
+++ b/include/status_led.h
@@ -346,6 +346,9 @@
 #elif defined(CONFIG_NIOS2)
 /* XXX empty just to avoid the error */
 /************************************************************************/
+#elif defined(CONFIG_BLACKFIN)
+/* XXX empty just to avoid the error */
+/************************************************************************/
 #elif defined(CONFIG_V38B)
 
 # define STATUS_LED_BIT		0x0010			/* Timer7 GPIO */