Add metadata files for atty. am: 14484ce0b3 am: 1d10dcacc5 am: 9fdc6a6b9f am: e41109e02f

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

Change-Id: Iaaa64309fe69e35c1b6ec66c8021ed28fe81afd8