Migrate to cargo_embargo. am: 94e4150511 am: f5f1c8f7a1 am: b015f19f96

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/crossbeam-channel/+/2829972

Change-Id: If90e808de6966b580a80cd7ee8f4c61bbd8ca2fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>