Verify that method arguments and results can share the same name.

Bug: 30778622
Test: hidl_test, hidl_test_java
Change-Id: Idb35a03337010c1fb63c2896f216392398e03e0c

tests/foo/1.0/IFoo.hal

@@ -95,4 +95,6 @@ interface IFoo {
 
     transpose(StringMatrix5x3 in) generates (StringMatrix3x5 out);
     transpose2(ThreeStrings[5] in) generates (FiveStrings[3] out);
+
+    sendVec(vec<uint8_t> data) generates (vec<uint8_t> data);
 };