Add BUILD file for zerocopy kleaf build am: 4402b52bd3 am: a6bb91992a am: 0a275e8ea7 am: 0f4834ed7b am: d6dd33ee0e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/zerocopy/+/2779409

Change-Id: Ia5820ec74ef47528df583bd6b595d635da5a3614
Signed-off-by: Automerger Merge Worker <[email protected]>