Add Android.bp file for mls-rs-crypto-traits am: 1d49e1affa am: bae61d45d0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/mls-rs-crypto-traits/+/3081519

Change-Id: I30ecd66a0c0420aee93c96d9f2aa4f64898da310
Signed-off-by: Automerger Merge Worker <[email protected]>