feat: enable Cilium source IP preservation (#1295)

**What problem does this PR solve?**:
Set Cilium's configuration to preserve source IPs from external
connections. See
https://docs.cilium.io/en/stable/network/kubernetes/kubeproxy-free/#client-source-ip-preservation

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Author: dkoshkin

charts/cluster-api-runtime-extensions-nutanix/addons/cni/cilium/values-template.yaml

@@ -42,6 +42,10 @@ k8sServiceHost: "{{ trimPrefix .ControlPlaneEndpoint.Host "https://" }}"
 k8sServicePort: "{{ .ControlPlaneEndpoint.Port }}"
 {{- if .EnableKubeProxyReplacement }}
 kubeProxyReplacement: true
+tunnelProtocol: geneve
+loadBalancer:
+  mode: dsr
+  dsrDispatch: geneve
 {{- end }}
 {{- if eq .Provider "eks" }}
 enableIPv4Masquerade: false