Reclassify OFL as notice per cl/537072410 am: 7f1841380b am: bb6391cf05

Original change: https://android-review.googlesource.com/c/platform/external/google-fonts/zilla-slab/+/2611895

Change-Id: I416ce0f948711df7e83f394a5af6a87460bab62d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>