ifdtool: don't write unused regions into a layout file

flashrom treats them as invalid because start > end.

Change-Id: I1c8b4563094823ebd9b1193b91e7b4a748955228
Signed-off-by: Alexander Couzens <lynxis@fe80.eu>
Reviewed-on: https://review.coreboot.org/16936
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
1 file changed