Add GCP encryption key to cluster model

SDA-7070

model/clusters_mgmt/v1/cluster_type.model

@@ -111,6 +111,9 @@ class Cluster {
 	// GCP Network.
 	GCPNetwork GCPNetwork
 
+	// Key used for encryption of GCP cluster nodes.
+	GCPEncryptionKey GCPEncryptionKey
+
 	// Date and time when the cluster was initially created, using the
 	// format defined in [RFC3339](https://www.ietf.org/rfc/rfc3339.txt).
 	CreationTimestamp Date

model/clusters_mgmt/v1/gcp_encryption_key_type.model

@@ -0,0 +1,27 @@
+/*
+Copyright (c) 2021 Red Hat, Inc.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// GCP Encryption Key for CCS clusters.
+struct GCPEncryptionKey {
+	// Name of the encryption key
+	KeyName              String
+	// Name of the key ring the encryption key is located on
+	KeyRing              String
+	// Location of the encryption key ring
+	KeyLocation          String
+	// Service account used to access the KMS key
+	KMSKeyServiceAccount String
+}