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/t4qds/t4240qds.c b/board/freescale/t4qds/t4240qds.c
index 869c01d..0b00ec6 100644
--- a/board/freescale/t4qds/t4240qds.c
+++ b/board/freescale/t4qds/t4240qds.c
@@ -9,6 +9,7 @@
 #include <env.h>
 #include <fdt_support.h>
 #include <i2c.h>
+#include <image.h>
 #include <init.h>
 #include <irq_func.h>
 #include <netdev.h>