Reclassify OFL as notice per cl/537072410 am: 1c40cc399c am: c4c8581aeb am: 487dc6a14a

Original change: https://android-review.googlesource.com/c/platform/external/fonttools/+/2612135

Change-Id: I51409d0d7a8f4e1d135036339c184ef7c87326a0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>