kata-types: Fix unnecessary_cast warnings

As we bumped the rust toolchain to 1.66.0, some new warnings have been
raised due to unnecessary_cast.

Let's fix them all here.

For more info about the warnings, please, take a look at:
https://rust-lang.github.io/rust-clippy/master/index.html#unnecessary_cast

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

src/libs/kata-types/src/config/hypervisor/mod.rs

@@ -1133,7 +1133,7 @@ mod tests {
                 },
                 output: CpuInfo {
                     cpu_features: "".to_string(),
-                    default_vcpus: default_vcpus as i32,
+                    default_vcpus,
                     default_maxvcpus: node_cpus,
                 },
             },