Move libdexfile out of runtime

Move the files out of runtime, leaving unfortunate dependences still
there on runtime/base (for the moment).  Also separates the build logic
into two Android.bp files.

Bug: 22322814
Test: make -j 50 test-art-host
Change-Id: Ib0a1cda833b29ecfa4c8c50f23fab89ba666f491
diff --git a/runtime/dex/art_dex_file_loader.cc b/runtime/dex/art_dex_file_loader.cc
index 08cf30d..0817cb4 100644
--- a/runtime/dex/art_dex_file_loader.cc
+++ b/runtime/dex/art_dex_file_loader.cc
@@ -25,10 +25,10 @@
 #include "base/stl_util.h"
 #include "base/systrace.h"
 #include "base/unix_file/fd_file.h"
-#include "compact_dex_file.h"
-#include "dex_file.h"
-#include "dex_file_verifier.h"
-#include "standard_dex_file.h"
+#include "dex/compact_dex_file.h"
+#include "dex/dex_file.h"
+#include "dex/dex_file_verifier.h"
+#include "dex/standard_dex_file.h"
 #include "zip_archive.h"
 
 namespace art {