Migrate to cargo_embargo. am: 73dccea8cf am: cf4ab6e0d7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/hashbrown/+/2826476

Change-Id: Ie1fdf307695918ea34cc4e7ed785e0298f5a1cb5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>