Can not set loadBalancerSourceRanges

Neither the [controller](https://github.com/apache/pinot/blob/master/kubernetes/helm/pinot/templates/controller/service-external.yaml) nor the [broker](https://github.com/apache/pinot/blob/master/kubernetes/helm/pinot/templates/broker/service-external.yaml) are able to accept a value for `loadBalancerSourceRanges`.

This is a minor change so I am happy to take care of it, should just require something like:
```
loadBalancerSourceRanges:
{{- range .Values.controller.external.loadBalancerSourceRanges }}
- {{ . | quote }}
{{- end }}
```