Fix gRPC buck util not to pickup random .proto files

- should address issue reported in
  https://gerrit.onosproject.org/15958

Change-Id: Id02b950e3a732c89b1c9f71499a6a23b18ad7123
diff --git a/protocols/p4runtime/proto/BUCK b/protocols/p4runtime/proto/BUCK
index f8623f8..fdb2515 100644
--- a/protocols/p4runtime/proto/BUCK
+++ b/protocols/p4runtime/proto/BUCK
@@ -52,4 +52,4 @@
 
 project_config(
     src_target = ':onos-protocols-p4runtime-proto'
-)
\ No newline at end of file
+)