Move FQName to libhidl-gen-util.

This will allow other libraries to process FQNames, namely libhidl.

Test: compiles
Change-Id: I015a69e016c5cef37f42e02b54c22663315e3676
diff --git a/AST.cpp b/AST.cpp
index dcf7495..6467c4f 100644
--- a/AST.cpp
+++ b/AST.cpp
@@ -18,7 +18,6 @@
 
 #include "Coordinator.h"
 #include "EnumType.h"
-#include "FQName.h"
 #include "HandleType.h"
 #include "Interface.h"
 #include "Location.h"
@@ -27,6 +26,7 @@
 #include "TypeDef.h"
 
 #include <hidl-util/Formatter.h>
+#include <hidl-util/FQName.h>
 #include <android-base/logging.h>
 #include <iostream>
 #include <stdlib.h>