Migrate to cargo_embargo. am: 59f8e81ad2 am: daf0ff4215

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

Change-Id: I066808c77eac53c7da2e14faff4c816e908cccb6
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>