Add Android.bp file am: cb80e1f241

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/mls-rs/+/3067222

Change-Id: If19e4573bd21f1f0a5b3caa23f0a7691e09847b6
Signed-off-by: Automerger Merge Worker <[email protected]>