Move toString() methods to android::hardware namespace

Bug: 36108426
Test: hidl_test passes

Change-Id: Ie86c0f2654cd75b1c4179f303287e50efa89376a
diff --git a/Type.cpp b/Type.cpp
index 546d6ab..585afc9 100644
--- a/Type.cpp
+++ b/Type.cpp
@@ -198,7 +198,7 @@
         Formatter &out,
         const std::string &streamName,
         const std::string &name) const {
-    emitDumpWithMethod(out, streamName, "::android::hardware::details::toString", name);
+    emitDumpWithMethod(out, streamName, "::android::hardware::toString", name);
 }
 
 void Type::emitDumpWithMethod(