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/compiler/driver/compiler_driver_test.cc b/compiler/driver/compiler_driver_test.cc
index 2698574..162904c 100644
--- a/compiler/driver/compiler_driver_test.cc
+++ b/compiler/driver/compiler_driver_test.cc
@@ -26,8 +26,8 @@
 #include "class_linker-inl.h"
 #include "common_compiler_test.h"
 #include "compiler_callbacks.h"
-#include "dex_file.h"
-#include "dex_file_types.h"
+#include "dex/dex_file.h"
+#include "dex/dex_file_types.h"
 #include "gc/heap.h"
 #include "handle_scope-inl.h"
 #include "jit/profile_compilation_info.h"