Migrate to cargo_embargo. am: becc9dc0d0

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

Change-Id: I2e3808c605020a2b15516f44e2718f2ab5893cbe
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>