Migrate to cargo_embargo. am: a663e31c94

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ppv-lite86/+/2822212

Change-Id: Id142a298075d452b6d1d765292086b11370ca66d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>