Merge "Mark apex-available" into main am: a459a6782c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rand_chacha/+/3163573

Change-Id: If0c19000dd4ad271764cee5ce98a07ca08c7ba4e
Signed-off-by: Automerger Merge Worker <[email protected]>