Reclassify OFL as notice per cl/537072410 am: 1a85bfcdd8

Original change: https://android-review.googlesource.com/c/platform/external/google-fonts/arbutus-slab/+/2611417

Change-Id: I609b392c4f6a5a9e9bccedf65b18175694d278f2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>