[rust toolchain] Fix non-Copy enum cast moves

Rust upstream PR "`as` cast of non-Copy enum is no longer a move" is breaking
newer rust toolchain builds.

Build breaking: https://turquoise-internal-review.googlesource.com/c/integration/+/602949
Upstream PR: rust-lang/rust#103016

Change-Id: I0caba268285ccdb00dd105dec87d2b80a03d3bfb
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/742085
Reviewed-by: Ben Wright <benwright@google.com>
Reviewed-by: Stephen Demos <sdemos@google.com>
Fuchsia-Auto-Submit: Andrew Pollack <andrewpollack@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>

Author: andrewpollack

src/security/kms-stateless/rust/src/lib.rs

@@ -12,7 +12,7 @@ const DERIVED_KEY_SIZE: usize = 16;
 const KEY_INFO_SIZE: usize = 32;
 const DEV_CLASS_TEE: &'static str = "/dev/class/tee/000";
 
-#[derive(Debug)]
+#[derive(Copy, Clone, Debug)]
 pub enum TaKeysafeCommand {
     GetUserDataStorageKey = 8,
     RotateHardwareDerivedKey = 9,