Staging: rt3070: remove dead code

While merging rt30[79]0 support into rt28[67]0, drivers/staging/rt3070/md4.h
has been forgotten, while it isn't referenced from the remaining drivers
anymore; remove it.
Signed-off-by: Stefan Lippers-Hollmann <s.l-h@gmx.de>
Acked-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Cc: Matti Lammi <mattij.lammi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rt3070/md4.h

-/*
- *************************************************************************
- * Ralink Tech Inc.
- * 5F., No.36, Taiyuan St., Jhubei City,
- * Hsinchu County 302,
- * Taiwan, R.O.C.
- *
- * (c) Copyright 2002-2007, Ralink Technology, Inc.
- *
- * This program is free software; you can redistribute it and/or modify  *
- * it under the terms of the GNU General Public License as published by  *
- * the Free Software Foundation; either version 2 of the License, or     *
- * (at your option) any later version.                                   *
- *                                                                       *
- * This program is distributed in the hope that it will be useful,       *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of        *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
- * GNU General Public License for more details.                          *
- *                                                                       *
- * You should have received a copy of the GNU General Public License     *
- * along with this program; if not, write to the                         *
- * Free Software Foundation, Inc.,                                       *
- * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
- *                                                                       *
- *************************************************************************
- */
-
-#ifndef __MD4_H__
-#define __MD4_H__
-
-/* MD4 context. */
-typedef	struct	_MD4_CTX_	{
-	unsigned long	state[4];        /* state (ABCD) */
-	unsigned long	count[2];        /* number of bits, modulo 2^64 (lsb first) */
-	u8	buffer[64];      /* input buffer */
-}	MD4_CTX;
-
-void MD4Init(MD4_CTX *);
-void MD4Update(MD4_CTX *, u8 *, UINT);
-void MD4Final(u8 [16], MD4_CTX *);
-
-#endif /*__MD4_H__*/