COIL: Change denylist to blocklist

The signer uses BLOCKLIST instead of DENYLIST. This patches make the
language match.

BUG=b:163883397
BRANCH=None
TEST=egrep -i -I -r "deny.*list"
TEST=make runtests

Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Change-Id: I47c913eb2ca89cd3eea4ca3ff5f1accb223ba418
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2401968
Reviewed-by: Mike Frysinger <vapier@chromium.org>
3 files changed