Migrate to cargo_embargo. am: bbe92c08da am: 237e7e9fb0 am: 7e9c710cad

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/buddy_system_allocator/+/2799496

Change-Id: I0ef87fc4d993779d843490e62c53766450bf2fed
Signed-off-by: Automerger Merge Worker <[email protected]>