Migrate to cargo_embargo. am: 6dbb08787b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/userfaultfd-sys/+/2835512

Change-Id: I6104b06894c45710308d6adf1d1dfebeeaca8109
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>