Make rand available to product and vendor am: 2a2524ae6c am: e71faa474a am: 666da98050 am: ca7b2fb14e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand/+/2476393

Change-Id: Iaaa87d9fee89b991d132e7a8a61bd4452bfb31b3
Signed-off-by: Automerger Merge Worker <[email protected]>