Migrate to cargo_embargo. am: 8f17a51220

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/vhost-device-vsock/+/2824790

Change-Id: I6bf5f8b6c87fb457b539f3fd642650b7610bf51f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>