Configure apex so crosvm can depend on this crate am: 784e24eb3f am: d4865997bc am: 71bc75fce8 am: 7728b23a4c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/1684666

Change-Id: Idd4a6b8ca219c6225c7307fa8b4cdbdfc57b426e