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

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

Change-Id: If396f053a2c712afc191230a35e4f21322c9e253
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>