ART: Move CopyOption to OatWriter

All the code has moved. Move the enum to where it's used.

Test: mmma art
Change-Id: Ia5d412acd1240365e74059681dbe8f62502382aa
diff --git a/dex2oat/dex2oat_options.h b/dex2oat/dex2oat_options.h
index cc124c1..27d3d25 100644
--- a/dex2oat/dex2oat_options.h
+++ b/dex2oat/dex2oat_options.h
@@ -28,6 +28,7 @@
 #include "dex/compact_dex_level.h"
 #include "driver/compiler_options_map.h"
 #include "image.h"
+#include "linker/oat_writer.h"
 
 namespace art {