Make userfaultfd-sys available to product and vendor am: cff16f5840 am: 6884d28c78 am: 21e6ee9cf4 am: 8a96aa179b

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/userfaultfd-sys/+/2476206

Change-Id: Ia77939f7509e54139e47513d8265b73ca087adb9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>