Migrate to cargo_embargo. am: a663e31c94 am: 84dd190994

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

Change-Id: Ic084b3dd5df5a26cce128d8fa287e2c87a09da80
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>