common: Drop image.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/board/freescale/ls1046ardb/eth.c b/board/freescale/ls1046ardb/eth.c
index 6ffd4ae..f3b1dcd 100644
--- a/board/freescale/ls1046ardb/eth.c
+++ b/board/freescale/ls1046ardb/eth.c
@@ -3,6 +3,7 @@
  * Copyright 2016 Freescale Semiconductor, Inc.
  */
 #include <common.h>
+#include <fdt_support.h>
 #include <net.h>
 #include <asm/io.h>
 #include <netdev.h>