Migrate to cargo_embargo. am: a4e9ae9e34 am: 46d0f20078 am: 75c4c36038

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/mio/+/2838080

Change-Id: Iaca18d4fd8a9b49e414ac4cc94d6e12413d041b8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>