Use MIT license type, specified in Cargo.toml am: 2aa894e207 am: 76905295b2 am: 1ba8b2a966

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/which/+/1466038

Change-Id: Ib9d4e91e383f2faaf60f56b734cc39049d21e885