PRESUBMIT.cfg: enable linting

Now that shellcheck has built-in support for ebuilds, we should run cros
lint on uploads instead of waiting for tricium to comment on patchsets.

BUG=None
TEST=repo upload

Change-Id: I1e0d583a95e992db2c083cf9cc2cb1160b90b386
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2441038
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Benjamin Gordon <bmgordon@chromium.org>
Tested-by: Benjamin Gordon <bmgordon@chromium.org>
1 file changed