Migrate to cargo_embargo. am: c82ca0ec5e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/octets/+/2824490

Change-Id: I7b636e52f760ec0ac13c0d656fa32fcdb3e54324
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>