Migrate to cargo_embargo. am: 934c8dd8ee am: 7bebf40d66 am: f38ad264a5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/remain/+/2834512

Change-Id: Iffd1aa781f1b2e03704f85f9051a15102f7257a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>