Update Android.bp by running cargo_embargo am: 6538921ca9 am: 1d3919cacc

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tokio-util/+/3096319

Change-Id: If214dd84b6128106c66b083b7e10e117483617f4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>