Rename @Immutable to @JavaOnlyImmutable

Test: atest aidl_integration_test aidl_unittests
Bug: 161506914
Change-Id: I0258d6af9b7378416435eb6b47098521ca7e8beb
diff --git a/aidl_language.h b/aidl_language.h
index 512636d..7a53332 100644
--- a/aidl_language.h
+++ b/aidl_language.h
@@ -166,7 +166,7 @@
     UTF8_IN_CPP,
     JAVA_PASSTHROUGH,
     JAVA_DEBUG,
-    IMMUTABLE,
+    JAVA_ONLY_IMMUTABLE,
   };
   static std::string TypeToString(Type type);
 
@@ -230,7 +230,7 @@
   bool IsNullable() const;
   bool IsUtf8InCpp() const;
   bool IsVintfStability() const;
-  bool IsImmutable() const;
+  bool IsJavaOnlyImmutable() const;
   bool IsStableApiParcelable(Options::Language lang) const;
   bool IsHide() const;
   bool IsJavaDebug() const;