Migrate to cargo_embargo. am: a663e31c94 am: 84dd190994 am: ffa1b9e504

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

Change-Id: I2a10de772cd1e026eaf79a299d8227c90d7ed2b1
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>