Update PRESUBMIT.cfg to include checks for release_notes.

BUG=b/173034990
TEST=manually checking on some changelists.
RELEASE_NOTE=None

Change-Id: I0513f12a5d6679ac4a68d4c6cbdd2239c300cd34
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/8561
Tested-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
Reviewed-by: Dexter Rivera <riverade@google.com>
2 files changed