It's helpful to see the sibling field, even when it's NULL, when
debugging the static.c output from a devictree.cb file. Ensure the
NULL fields are emitted for fullness.
Change-Id: Ib6d5b8164769a6512e762d5a525c7df1f429c866
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/39862
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>