hidl-gen: add support for predefined types

b/31221346 Add support for predefined types in HIDL

Change-Id: I090c1ab2f10d4748e53b58485b1ef05114554d01
Signed-off-by: Iliyan Malchev <malchev@google.com>
diff --git a/AST.cpp b/AST.cpp
index d13167a..3ba33c6 100644
--- a/AST.cpp
+++ b/AST.cpp
@@ -21,6 +21,7 @@
 #include "FQName.h"
 #include "HandleType.h"
 #include "Interface.h"
+#include "PredefinedType.h"
 #include "Scope.h"
 #include "TypeDef.h"