Migrate to cargo_embargo. am: 25ae9e30f0 am: 867fa8abfb am: 10d07e1fb7

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/fxhash/+/2822241

Change-Id: I30a432b600f62da7755360ec30aeac4bd31ee51e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>