Migrate 25 crates to monorepo. am: eacd222621

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/3249090

Change-Id: I44fd7555d6dc3e5201a630070695e19dd9695d58
Signed-off-by: Automerger Merge Worker <[email protected]>