[VOL-5567] Upgrade protos and remove deprecated dependencies

Change-Id: I699f46a8f3f6140431d7e813b6ae48f3db55f45c
Signed-off-by: bseeniva <balaji.seenivasan@radisys.com>
diff --git a/internal/pkg/vpagent/changeEvent.go b/internal/pkg/vpagent/changeEvent.go
index e975396..df509ce 100644
--- a/internal/pkg/vpagent/changeEvent.go
+++ b/internal/pkg/vpagent/changeEvent.go
@@ -21,8 +21,8 @@
 
 	"voltha-go-controller/log"
 
-	"github.com/golang/protobuf/ptypes/empty"
 	"google.golang.org/grpc"
+	"google.golang.org/protobuf/types/known/emptypb"
 )
 
 func (vpa *VPAgent) receiveChangeEvents(ctx context.Context) {
@@ -45,7 +45,7 @@
 		return
 	}
 
-	stream, err := vServiceClient.ReceiveChangeEvents(streamCtx, &empty.Empty{}, opt)
+	stream, err := vServiceClient.ReceiveChangeEvents(streamCtx, &emptypb.Empty{}, opt)
 	if err != nil {
 		logger.Errorw(ctx, "Unable to establish Receive Change Event Stream",
 			log.Fields{"error": err})
@@ -61,7 +61,7 @@
 		default:
 			ce, err := stream.Recv()
 			if err == io.EOF {
-				stream, err = vServiceClient.ReceiveChangeEvents(streamCtx, &empty.Empty{}, opt)
+				stream, err = vServiceClient.ReceiveChangeEvents(streamCtx, &emptypb.Empty{}, opt)
 				if err != nil {
 					logger.Errorw(ctx, "Unable to establish Receive Change Event Stream",
 						log.Fields{"error": err})