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/profman/boot_image_profile.h b/profman/boot_image_profile.h
index d02e408..eb43b7c 100644
--- a/profman/boot_image_profile.h
+++ b/profman/boot_image_profile.h
@@ -21,7 +21,7 @@
 #include <memory>
 #include <vector>
 
-#include "dex_file.h"
+#include "dex/dex_file.h"
 #include "jit/profile_compilation_info.h"
 
 namespace art {