Use voltha-protos version 4.0.2
Bump major version of voltha-lib-go to 4.0.0 as this change results
in incompatible API version compared to previous version

Change-Id: I1def58361fb1d85f07d6948ebf1ffb7a92eb0d4c
diff --git a/Makefile b/Makefile
index 0416acd..938faa1 100644
--- a/Makefile
+++ b/Makefile
@@ -49,8 +49,8 @@
 	@mkdir -p python/local_imports
 ifdef LOCAL_PROTOS
 	rm -rf vendor/github.com/opencord/voltha-protos
-	mkdir -p vendor/github.com/opencord/voltha-protos/v3/go
-	cp -r ${LOCAL_PROTOS}/go/* vendor/github.com/opencord/voltha-protos/v3/go
+	mkdir -p vendor/github.com/opencord/voltha-protos/v4/go
+	cp -r ${LOCAL_PROTOS}/go/* vendor/github.com/opencord/voltha-protos/v4/go
 	rm -rf python/local_imports/voltha-protos
 	mkdir -p python/local_imports/voltha-protos/dist
 	cp ${LOCAL_PROTOS}/dist/*.tar.gz python/local_imports/voltha-protos/dist/