Merge "Add unlicense support to add3prf.py" into main am: 844b604fec am: d2554dab42 am: 0c105403e6

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

Change-Id: I9cb26b7ce106b73d662d85ae743421f514765dfb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>