Suppress dead code clippy lints for crosvm

```
error: field `vm_service` is never read
   -->
packages/modules/Virtualization/android/virtmgr/src/crosvm.rs:372:9
    |
348 | pub struct VmInstance {
    |            ---------- field in this struct
...
372 |     pub vm_service: Mutex<Option<Strong<dyn
IVirtualMachineService>>>,
    |         ^^^^^^^^^^
    |
    = note: `VmInstance` has a derived impl for the trait `Debug`, but
this is intentionally ignored during dead code analysis
    = note: `-D dead-code` implied by `-D warnings`
    = help: to override `-D warnings` add `#[allow(dead_code)]`
```

Bug: http://b/346588808
Test: ./toolchain/android_rust/tools/test_compiler.py --target aosp_cf_x86_64_phone --image --reuse-prebuilt
Change-Id: I18b77113fe587289d98bd867e841c959b7cacab7
1 file changed
tree: ec56fa12b8c1ac4da180e8cada316d900e88b892
  1. android/
  2. build/
  3. docs/
  4. guest/
  5. libs/
  6. tests/
  7. .clang-format
  8. .gitignore
  9. dice_for_avf_guest.cddl
  10. OWNERS
  11. PREUPLOAD.cfg
  12. README.md
  13. rustfmt.toml
  14. TEST_MAPPING
README.md

Android Virtualization Framework (AVF)

Android Virtualization Framework (AVF) provides secure and private execution environments for executing code. AVF is ideal for security-oriented use cases that require stronger isolation assurances over those offered by Android’s app sandbox.

Visit our public doc site to learn more about what AVF is, what it is for, and how it is structured. This repository contains source code for userspace components of AVF.

If you want a quick start, see the getting started guideline and follow the steps there.

For in-depth explanations about individual topics and components, visit the following links.

AVF components:

AVF APIs:

How-Tos: