util/lint: Run lint-extended-007-checkpatch checks in parallel

Instead of checking each directory in series, kick off all the checks
in parallel and then wait for them to finish.  Failures print out with
file information, so mixing output isn't a problem.  This reduces
the time it takes to run on lumberingbuilder from 31 seconds to 6.

Change-Id: I1252a68a723370389d399f3d1a2aff3fad64c365
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/26995
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

0 files changed, 0 insertions, 0 deletions