Migrate to cargo_embargo. am: 59f8e81ad2 am: 13d9116dde am: 20b63c19d7

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

Change-Id: I23b418eb3c72ec8896fca749fdbf7f2baaf76b57
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>