common: Move the image globals into image.h

These three globals relate to image handling. Move them to the image
header file.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/image.h b/include/image.h
index 86ebaae..3649644 100644
--- a/include/image.h
+++ b/include/image.h
@@ -112,6 +112,10 @@
 # define IMAGE_OF_SYSTEM_SETUP	0
 #endif
 
+extern ulong image_load_addr;		/* Default Load Address */
+extern ulong image_save_addr;		/* Default Save Address */
+extern ulong image_save_size;		/* Default Save Size */
+
 enum ih_category {
 	IH_ARCH,
 	IH_COMP,