Technically we don't need this. the instruction below:
```
// +k8s:conversion-gen=k8s.io/kubernetes/pkg/controller/apis/config/v1alpha1
```
registers the apiserver/apimachinery packages in the "package universe"
of the conversion-gen program per comment from lucas in PR 68233

However it looks like some files that use both packages run into trouble
and causes failures in CI harness. Attempting here to see if we fix the
order by specifying them explicitly helps.

Change-Id: I20e9c9256f0b7ffdf4e2101d0ca1fe5090e51344