Migrate to cargo_embargo. am: becc9dc0d0 am: 44612c5b78 am: 76bcd4057b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rustc-hash/+/2832451

Change-Id: I97d18c7da9eda7e4c1343e446f4f55b9c6b275e5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>