Migrate to cargo_embargo. am: 22f4e7a52a am: c0b1c39760

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/half/+/2822894

Change-Id: I6f61f87592e7969cd06eb12139cd0aec1aaa4e1c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>