Migrate to cargo_embargo. am: a663e31c94 am: 9a4d1de1c1 am: 4192406f46

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

Change-Id: Id1d91c0fb8b6bdb15dd3897665ad98f573a244aa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>