m/n/k/reconciler: remove PSP role and rolebinding

Pod Security Policies have been removed from Kubernetes. The default PSP 
was removed in commit 6211e4dc40, but the role and rolebinding was still 
left. They do not have a function anymore. Now that reconciler updates 
are implemented, these will be removed from existing clusters after 
upgrading.

Change-Id: Ia953a5ae03c581b15efc4e3b3711aaa008dc145d
Reviewed-on: https://review.monogon.dev/c/monogon/+/3091
Tested-by: Jenkins CI
Reviewed-by: Lorenz Brun <lorenz@monogon.tech>
diff --git a/metropolis/node/kubernetes/controller-manager.go b/metropolis/node/kubernetes/controller-manager.go
index 252de53..71918f9 100644
--- a/metropolis/node/kubernetes/controller-manager.go
+++ b/metropolis/node/kubernetes/controller-manager.go
@@ -77,7 +77,7 @@
 				pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: config.rootCA})),
 			args.FileOpt("--client-ca-file", "root-ca.pem",
 				pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: config.rootCA})),
-			"--use-service-account-credentials=true", // Enables things like PSP enforcement
+			"--use-service-account-credentials=true",
 			fmt.Sprintf("--cluster-cidr=%v", config.clusterNet.String()),
 			fmt.Sprintf("--service-cluster-ip-range=%v", config.serviceNet.String()),
 			args.FileOpt("--tls-cert-file", "server-cert.pem",