fs.mitm: Add HANS-style redirection for System Data Archives.

stratosphere/fs_mitm/source/fsmitm_utils.hpp

@@ -0,0 +1,8 @@
+#pragma once
+#include <switch.h>
+#include <stratosphere.hpp>
+
+class Utils {
+    public:
+        static Result OpenSdFile(const char *fn, int flags, FsFile *out);
+};