blackfin: fixing warning by including proper headers

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
diff --git a/board/bf609-ezkit/bf609-ezkit.c b/board/bf609-ezkit/bf609-ezkit.c
index 0388226..cfc64fe 100644
--- a/board/bf609-ezkit/bf609-ezkit.c
+++ b/board/bf609-ezkit/bf609-ezkit.c
@@ -10,6 +10,7 @@
 #include <netdev.h>
 #include <asm/blackfin.h>
 #include <asm/io.h>
+#include <asm/sdh.h>
 #include <asm/portmux.h>
 #include "soft_switch.h"