Migrate to cargo_embargo. am: a4c1350c71

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/tracing-attributes/+/2836876

Change-Id: Ib47902e964c158179d6988815e706b843821f35c
Signed-off-by: Automerger Merge Worker <[email protected]>