hidl-gen: Fix warnings for unused parameters.

Test: `mma` does not have warnings on unused paramters
      on GraphAll.cpp.

Change-Id: Ib4ddd38c34f1de5aef1cdefdfa0539840fb44a8e
diff --git a/VectorType.cpp b/VectorType.cpp
index 8bf3ede..b7bebe4 100644
--- a/VectorType.cpp
+++ b/VectorType.cpp
@@ -248,6 +248,11 @@
         parcelObjIsPointer, isReader, mode, "", "");
 }
 
+bool VectorType::useParentInEmitResolveReferencesEmbedded() const {
+    // parentName and offsetText is not used in emitResolveReferencesEmbedded
+    return false;
+}
+
 void VectorType::emitResolveReferencesEmbeddedHelper(
             Formatter &out,
             size_t depth,