The generated layout tests should pass the borrow_as_ptr clippy lint

The generated layout tests should use `addr_of` and pass the `borrow_as_ptr` clippy lint.

## Steps to reproduce

1) Generate bindings that contain the layout tests in your build
2) run `cargo clippy -v --tests -D warnings`

### Actual Results

Tests fail the `borrow_as_ptr` lint.

### Expected Results

All the things pass clippy.
