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

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

Change-Id: Ifb0bde5b4502c47e6bdec30c98ad206633253eae
Signed-off-by: Automerger Merge Worker <[email protected]>