Merge "Add unlicense support to add3prf.py" into main am: 844b604fec am: d2554dab42

Original change: https://android-review.googlesource.com/c/platform/development/+/2888607

Change-Id: I3c34f1c70b87b1753835ed85f9bff65a0c6b4eea
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>