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/advantech/imx8qm_rom7720_a1/spl.c b/board/advantech/imx8qm_rom7720_a1/spl.c
index 3f31a8f..6863da8 100644
--- a/board/advantech/imx8qm_rom7720_a1/spl.c
+++ b/board/advantech/imx8qm_rom7720_a1/spl.c
@@ -4,6 +4,7 @@
  */
 #include <common.h>
 #include <dm.h>
+#include <image.h>
 #include <spl.h>
 #include <fsl_esdhc.h>