Make nix available to product and vendor am: 3e85770325 am: dca9aae545 am: 25b21a099e am: ecbc9ecccf am: f120190ec6

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/nix/+/2475616

Change-Id: I75658d2cb4d1460b8eda44ee3cab83d007629422
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>