DeviceInfo changes for voltha rsrc_mgr

Change-Id: I2411d14d4810e063c6c7a6c0ce07b659f6d992f7
diff --git a/core/core_server.go b/core/core_server.go
index 48f0ed8..f00d72d 100644
--- a/core/core_server.go
+++ b/core/core_server.go
@@ -92,7 +92,7 @@
 		Vethnames:    []string{},
 		IndInterval:  opt.intvl,
 		Processes:    []string{},
-		EnableServer: new(openolt.Openolt_EnableIndicationServer),
+		EnableServer: nil,
 		state:        INACTIVE,
 		stateChan:    make(chan coreState, 8),
 	}