image: Correct auto-fit architecture property name

The fit_write_images() function incorrectly uses the long name for the
architecture. This cannot be parsed with the FIT is read. Fix this by using
the short name instead.

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

tools/fit_image.c

@@ -195,7 +195,8 @@ static int fit_write_images(struct image_tool_params *params, char *fdt)
 	fdt_begin_node(fdt, str);
 	fdt_property_string(fdt, "description", params->imagename);
 	fdt_property_string(fdt, "type", typename);
-	fdt_property_string(fdt, "arch", genimg_get_arch_name(params->arch));
+	fdt_property_string(fdt, "arch",
+			    genimg_get_arch_short_name(params->arch));
 	fdt_property_string(fdt, "os", genimg_get_os_short_name(params->os));
 	fdt_property_string(fdt, "compression",
 			    genimg_get_comp_short_name(params->comp));