Migrate to cargo_embargo. am: a663e31c94

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

Change-Id: I59728d34d6bb4ed033b88af1a82d891a9e76408a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>