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

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

Change-Id: Ia2a15cd183df49ee3f0a9d3a328abe75ee5cba9c