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

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

Change-Id: I563f4d860306252516c0896b919c41f5f23fbada
Signed-off-by: Automerger Merge Worker <[email protected]>