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/cmd/bootefi.c b/cmd/bootefi.c
index 9849eb4..b843734 100644
--- a/cmd/bootefi.c
+++ b/cmd/bootefi.c
@@ -13,6 +13,7 @@
 #include <efi_selftest.h>
 #include <env.h>
 #include <errno.h>
+#include <image.h>
 #include <malloc.h>
 #include <linux/libfdt.h>
 #include <linux/libfdt_env.h>