Allow PATCH Event Resource

While testing the master branch I noticed this error

```
'events "foobarfoobarfoobarfoobarfoobarfoobar.155e2c1afd13d7ce" is forbidden:
User "system:serviceaccount:aws-service-operator:aws-service-operator" cannot
patch events in the namespace "default"' (will not retry!)
```

I updated the cluster role definition to allow this action

Signed-off-by: Alexander Tanton <tantonat@amazon.com>

code-generation/pkg/codegen/assets/aws-service-operator.yaml.templ

@@ -41,13 +41,15 @@ items:
     - pods
     - configmaps
     - services
+    - events
     verbs:
     - get
     - list
     - watch
     - create
     - delete
     - update
+    - patch
   - apiGroups:
     - apiextensions.k8s.io
     resources: