image: Create a table of information for each category

Add a table that contains the category name, the number of items in each
category and a pointer to the table of items. This will allow us to use
generic code to deal with the categories.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

include/image.h

@@ -123,6 +123,15 @@ struct lmb;
 # define IMAGE_OF_SYSTEM_SETUP	0
 #endif
 
+enum ih_category {
+	IH_ARCH,
+	IH_COMP,
+	IH_OS,
+	IH_TYPE,
+
+	IH_COUNT,
+};
+
 /*
  * Operating System Codes
  */