update helm chart to ensure that created eniconfig name is always a string (#3227)

Author: cheeseandcereal

charts/aws-vpc-cni/templates/eniconfig.yaml

@@ -3,7 +3,7 @@
 apiVersion: crd.k8s.amazonaws.com/v1alpha1
 kind: ENIConfig
 metadata:
-  name: {{ $key }}
+  name: "{{ $key }}"
 spec:
   {{- if $value.securityGroups }}
   securityGroups: