Create dex subdirectory

Move all the DexFile related source to a common subdirectory dex/ of
runtime.

Bug: 71361973
Test: make -j 50 test-art-host
Change-Id: I59e984ed660b93e0776556308be3d653722f5223
diff --git a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
index b8d96af..1ab67ec 100644
--- a/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
+++ b/runtime/entrypoints/quick/quick_alloc_entrypoints.cc
@@ -19,7 +19,7 @@
 #include "art_method-inl.h"
 #include "base/enums.h"
 #include "callee_save_frame.h"
-#include "dex_file_types.h"
+#include "dex/dex_file_types.h"
 #include "entrypoints/entrypoint_utils-inl.h"
 #include "mirror/class-inl.h"
 #include "mirror/object-inl.h"