Migrate to cargo_embargo. am: 59f8e81ad2 am: daf0ff4215 am: 1a10ef1e7e

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

Change-Id: I2ea1e143a3f34fe2d6319c77272c09a9bb0dc24c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>