Merge "Add variant of libtokio for test" am: 9c455c5ce5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tokio/+/2475668

Change-Id: I309e2edad0720d3b79f2d3409b826921573956e8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>