Add metadata files for atty. am: 14484ce0b3 am: 1d10dcacc5 am: 9fdc6a6b9f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/atty/+/1620968

Change-Id: I17f4343b06c05dcc5aef5973273476f4c4b65fe1