Make shared_child available to product and vendor am: a69db7bb0a am: 18b2f11d2d am: 799b95ed13 am: 522cf3b6fd

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/shared_child/+/2475619

Change-Id: I985f3af81bdeb47d53abe4af98609549754b971d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>