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: Id5389bfa6297296e87926b45287a7b894ee629e3
Signed-off-by: Automerger Merge Worker <[email protected]>