Fix coreboot project-specific pre-upload hooks

- Coreboot is now a public repo, and is named
  "chromiumos/third_party/coreboot", not "chromeos...".
- Add Signed-off-by presubmit check, since it's a requirement upstream.

BUG=chromium:338878
TEST=Verified that coreboot commit without sign-off was caught by presubmit.
Verified that adding sign-off allowed presubmit pass.

Change-Id: I6be53109ac278f90004538e5984f8715354ba9f8
Reviewed-on: https://chromium-review.googlesource.com/184250
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Stefan Reinauer <reinauer@google.com>
Commit-Queue: Shawn Nematbakhsh <shawnn@chromium.org>
Tested-by: Shawn Nematbakhsh <shawnn@chromium.org>
1 file changed