util/lint: Update lint-000-license-headers linter

- Add some directories and files to the ignore list
- Add the LGPL as a recognized header.  It's used in some files that
were pulled into coreboot from other sources.

Change-Id: I53423205f1cbf142a294ee5d24e885741a44dfcd
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/26572
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
1 file changed