hidl-gen: add sanitizedName to emitReaderWriterEmbedded.

* Fix weird variable names in autogenerated code for vec<vec<T>>.

Bug: 31955917

Test: hidl_test
Change-Id: I83363a6d12babae1aba8e118451e1ec80492012c
diff --git a/StringType.h b/StringType.h
index 52e44b0..2fb585f 100644
--- a/StringType.h
+++ b/StringType.h
@@ -49,6 +49,7 @@
             Formatter &out,
             size_t depth,
             const std::string &name,
+            const std::string & /*sanitizedName*/,
             bool nameIsPointer,
             const std::string &parcelObj,
             bool parcelObjIsPointer,