Migrate to cargo_embargo. am: 88037d1910

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bitreader/+/2796197

Change-Id: If145f80efd9612437fb3a6394e6dd5b31f8233b9
Signed-off-by: Automerger Merge Worker <[email protected]>