checkpatch: disable SPDX_LICENSE_TAG

We use standard Chrome OS copyright headers in this repo, so no need
to check for the SPDX tags, which can confuse people when adding new
files.

BUG=none
TEST=pre-upload on test commit with new file, standard copyright
     headers

Change-Id: I60a1f5d3354cbff49f033cc98dfe2f1b5b90c84c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/mosys/+/3044228
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Auto-Submit: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
1 file changed