Don't process PVCs for in-tree volumes

Request for provisioning of in-tree volume plugins that were migrated to
CSI will always have CSI driver name in annStorageProvisioner.

cmd/csi-provisioner/csi-provisioner.go

@@ -176,7 +176,6 @@ func main() {
 			klog.Fatalf("Failed to get InTree plugin name for migrated CSI plugin %s: %v", provisionerName, err)
 		}
 		klog.V(2).Infof("Supports migration from in-tree plugin: %s", supportsMigrationFromInTreePluginName)
-		provisionerOptions = append(provisionerOptions, controller.AdditionalProvisionerNames([]string{supportsMigrationFromInTreePluginName}))
 	}
 
 	// Create the provisioner: it implements the Provisioner interface expected by