Remove unused files, and tidy the directory structure of the remaining ones.

firmware/lib/cryptolib/rsa.c

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /* Implementation of RSA signature verification which uses a pre-processed
  * key for computation. The code extends Android's RSA verification code to
  * support multiple RSA key lengths and hash digest algorithms.
  */
 
@@ skipping 167 matching lines @@
               buf[i]);
 #endif
       success = 0;
     }
   }
 
   Free(buf);
 
   return success;
 }