AAPT2: Move format related files under same directory

Test: make aapt2_tests
Change-Id: Id72cdfc12ba3add294048e60c55f2461344464bf
diff --git a/tools/aapt2/cmd/Optimize.cpp b/tools/aapt2/cmd/Optimize.cpp
index 56b61d0..67ac67a 100644
--- a/tools/aapt2/cmd/Optimize.cpp
+++ b/tools/aapt2/cmd/Optimize.cpp
@@ -31,8 +31,8 @@
 #include "cmd/Util.h"
 #include "configuration/ConfigurationParser.h"
 #include "filter/AbiFilter.h"
-#include "flatten/TableFlattener.h"
-#include "flatten/XmlFlattener.h"
+#include "format/binary/TableFlattener.h"
+#include "format/binary/XmlFlattener.h"
 #include "io/BigBufferInputStream.h"
 #include "io/Util.h"
 #include "optimize/MultiApkGenerator.h"