Simplify nftables/proxier.go by removing localhost nodeport support

and related route_localnet setting / anti-martian-packet rule

pkg/generated/openapi/zz_generated.openapi.go

@@ -54716,13 +54716,6 @@ func schema_k8sio_kube_proxy_config_v1alpha1_KubeProxyNFTablesConfiguration(ref
 							Format:      "",
 						},
 					},
-					"localhostNodePorts": {
-						SchemaProps: spec.SchemaProps{
-							Description: "localhostNodePorts, if false, tells kube-proxy to disable the legacy behavior of allowing NodePort services to be accessed via localhost. FIXME: remove.",
-							Type:        []string{"boolean"},
-							Format:      "",
-						},
-					},
 					"syncPeriod": {
 						SchemaProps: spec.SchemaProps{
 							Description: "syncPeriod is an interval (e.g. '5s', '1m', '2h22m') indicating how frequently various re-synchronizing and cleanup operations are performed. Must be greater than 0.",
@@ -54736,7 +54729,7 @@ func schema_k8sio_kube_proxy_config_v1alpha1_KubeProxyNFTablesConfiguration(ref
 						},
 					},
 				},
-				Required: []string{"masqueradeBit", "masqueradeAll", "localhostNodePorts", "syncPeriod", "minSyncPeriod"},
+				Required: []string{"masqueradeBit", "masqueradeAll", "syncPeriod", "minSyncPeriod"},
 			},
 		},
 		Dependencies: []string{