vboot: use cbfstool truncate

Instead of a shell based parser for cbfstool print -k output.

BUG=b:65853903
BRANCH=none
TEST=`abuild -x -t GOOGLE_KEVIN -p none` creates a valid-looking image.

Change-Id: I33b7e1c483a69e66e82541c09582be2a71356a10
Signed-off-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-on: https://review.coreboot.org/21609
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

0 files changed, 0 insertions, 0 deletions