Migrate to cargo_embargo. am: daf8a2b219 am: 3d8547d523

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-trait/+/2799293

Change-Id: Ie3280527677045e0a455280ecb23081f4272fb66
Signed-off-by: Automerger Merge Worker <[email protected]>