Make half available to product and vendor am: e8052b94f1 am: a86abd5b1d am: f58bcda4ae am: fffa7531fa

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/half/+/2476412

Change-Id: Ieead91a78b52012582759513c8b73a587178036a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>