test: vboot: clean its file

This update the its file used in vboot test to respect the new
node style name defined in doc/uImage.FIT (for example: replace
kernel@1 by kernel and fdt@1 by fdt-1)

Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
9 files changed