cephfs: add volumegroup service capability

Add GROUP_CONTROLLER_SERVICE capabilities to
the GetPluginCapabilities of the cephFS
plugin.

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

internal/cephfs/identityserver.go

@@ -58,6 +58,13 @@ func (is *IdentityServer) GetPluginCapabilities(
 					},
 				},
 			},
+			{
+				Type: &csi.PluginCapability_Service_{
+					Service: &csi.PluginCapability_Service{
+						Type: csi.PluginCapability_Service_GROUP_CONTROLLER_SERVICE,
+					},
+				},
+			},
 		},
 	}, nil
 }