[VOL-4119] voltha-core incorrect args for Get-Onu-Image

Change-Id: Ibe99ab3956c1427584d5ba4f77693458342ad111
diff --git a/rw_core/core/device/agent_image.go b/rw_core/core/device/agent_image.go
index 94a8706..74a60c7 100644
--- a/rw_core/core/device/agent_image.go
+++ b/rw_core/core/device/agent_image.go
@@ -545,7 +545,7 @@
 	subCtx, cancel := context.WithTimeout(log.WithSpanFromContext(context.Background(), ctx), agent.defaultTimeout)
 	defer cancel()
 	subCtx = coreutils.WithRPCMetadataFromContext(subCtx, ctx)
-	logger.Debugw(ctx, "get-onu-images", log.Fields{"device-id": agent.deviceID})
+	logger.Debug(ctx, "get-onu-images")
 
 	// Send the request to the adapter
 	ch, err := agent.adapterProxy.GetOnuImages(subCtx, cloned, id)