[LSC] Add LOCAL_LICENSE_KINDS to external/google-fonts/zilla-slab am: 776443897f

Original change: https://android-review.googlesource.com/c/platform/external/google-fonts/zilla-slab/+/1588638

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ib00a6a6650bf82b04ea89d14d878976b991ad4e8