AAPT2: Move format related files under same directory

Test: make aapt2_tests
Change-Id: Id72cdfc12ba3add294048e60c55f2461344464bf
diff --git a/tools/aapt2/xml/XmlDom_test.cpp b/tools/aapt2/xml/XmlDom_test.cpp
index 6b97ae6..4ba0443 100644
--- a/tools/aapt2/xml/XmlDom_test.cpp
+++ b/tools/aapt2/xml/XmlDom_test.cpp
@@ -18,7 +18,7 @@
 
 #include <string>
 
-#include "flatten/XmlFlattener.h"
+#include "format/binary/XmlFlattener.h"
 #include "io/StringInputStream.h"
 #include "test/Test.h"