Add legacy_permissive license kind.

Missed a license kind needed for the large-scale-change. It didn't turn
up in testing until all the --override and --filter flags were
determined.

See: http://go/android-license-checking-v2-lsc

Bug: 151953481
Bug: 151177513
Bug: 67772237

Change-Id: Ic6b5f11717e88504e09d4817e9952d3ed1132b93