[LSC] Add LOCAL_LICENSE_KINDS to external/pffft am: 3e2ecbdc24 am: 3b884b26c0 am: da39db782b

Original change: https://android-review.googlesource.com/c/platform/external/pffft/+/1588588

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ic66caee006380e2908323f4911bf6ff8b722016e