Migrate to cargo_embargo. am: ade89fb953

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/sec1/+/2832812

Change-Id: I6110f93e7f92ff9ff98c6f92faa3cde9c338a59d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>