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/t4rdb/t4240rdb.c b/board/freescale/t4rdb/t4240rdb.c
index 8015666..d801f2c 100644
--- a/board/freescale/t4rdb/t4240rdb.c
+++ b/board/freescale/t4rdb/t4240rdb.c
@@ -8,6 +8,7 @@
 #include <env.h>
 #include <fdt_support.h>
 #include <i2c.h>
+#include <image.h>
 #include <init.h>
 #include <netdev.h>
 #include <linux/compiler.h>