And one more backend for hidl-gen to create a simple static java library

exporting all annotated constants.

Bug: 32200867
Test: make
Change-Id: Ifddf296fea7b31cbf7bf8d3a42159ad43004805c
diff --git a/EnumType.h b/EnumType.h
index e7823ef..c464cd2 100644
--- a/EnumType.h
+++ b/EnumType.h
@@ -85,7 +85,7 @@
     void appendToExportedTypesVector(
             std::vector<const Type *> *exportedTypes) const override;
 
-    status_t emitExportedHeader(Formatter &out) const override;
+    status_t emitExportedHeader(Formatter &out, bool forJava) const override;
 
 private:
     void getTypeChain(std::vector<const EnumType *> *out) const;