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/renesas/rcar-common/common.c b/board/renesas/rcar-common/common.c
index 37f8a46..5a6aa82 100644
--- a/board/renesas/rcar-common/common.c
+++ b/board/renesas/rcar-common/common.c
@@ -11,6 +11,7 @@
 #include <dm.h>
 #include <dm/uclass-internal.h>
 #include <asm/arch/rmobile.h>
+#include <linux/libfdt.h>
 
 #ifdef CONFIG_RCAR_GEN3