Migrate to cargo_embargo. am: 888635dbe0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/serde-xml-rs/+/2832452

Change-Id: I4273bdc650ccbb94f82ceda759740a5340239cf7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>