Move FQName to libhidl-gen-util.

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

Test: compiles
Change-Id: I015a69e016c5cef37f42e02b54c22663315e3676
diff --git a/main.cpp b/main.cpp
index 6d763b7..ab6b9ff 100644
--- a/main.cpp
+++ b/main.cpp
@@ -16,10 +16,10 @@
 
 #include "AST.h"
 #include "Coordinator.h"
-#include "FQName.h"
 #include "Scope.h"
 
 #include <hidl-util/Formatter.h>
+#include <hidl-util/FQName.h>
 #include <hidl-util/StringHelper.h>
 #include <android-base/logging.h>
 #include <set>