Migrate to cargo_embargo. am: 59f8e81ad2

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/async-stream-impl/+/2824655

Change-Id: I692bdf3b5678e49115ef93dbe5d1dc2b88e7e3d1
Signed-off-by: Automerger Merge Worker <[email protected]>