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/keymile/kmp204x/kmp204x.c b/board/keymile/kmp204x/kmp204x.c
index 0a6cf1f..21afbc7 100644
--- a/board/keymile/kmp204x/kmp204x.c
+++ b/board/keymile/kmp204x/kmp204x.c
@@ -10,6 +10,7 @@
 #include <command.h>
 #include <env.h>
 #include <fdt_support.h>
+#include <image.h>
 #include <init.h>
 #include <netdev.h>
 #include <linux/compiler.h>