Migrate to cargo_embargo. am: efe366f7f8

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/document-features/+/2832654

Change-Id: Id0f694486e17d6587d76fe5f8a68c2927793a774
Signed-off-by: Automerger Merge Worker <[email protected]>