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/dex_cache_resolved_classes.h b/runtime/dex_cache_resolved_classes.h
index 2278b05..ca6afc5 100644
--- a/runtime/dex_cache_resolved_classes.h
+++ b/runtime/dex_cache_resolved_classes.h
@@ -21,7 +21,7 @@
 #include <unordered_set>
 #include <vector>
 
-#include "dex_file_types.h"
+#include "dex/dex_file_types.h"
 
 namespace art {