Move missed files to libdexfile

Reduce the dependencies on utf and utils in preparation for separate
directory.

Bug: 22322814
Test: make -j 50 test-art-host
      make -j 50 dexdump2 dexlist

Change-Id: Icdecf895dafec63ef903514eef79d459abc14925
diff --git a/runtime/utf.cc b/runtime/utf.cc
index 93fcb32..32ae187 100644
--- a/runtime/utf.cc
+++ b/runtime/utf.cc
@@ -18,8 +18,7 @@
 
 #include <android-base/logging.h>
 
-#include "mirror/array.h"
-#include "mirror/object-inl.h"
+#include "base/casts.h"
 #include "utf-inl.h"
 
 namespace art {