tile: remove unused ISA_DMA_THRESHOLD define

No need to define ISA_DMA_THRESHOLD
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
[cmetcalf@tilera.com: converted to a single-line #include file]
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

arch/tile/include/asm/scatterlist.h

-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   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, version 2.
- *
- *   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, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#ifndef _ASM_TILE_SCATTERLIST_H
-#define _ASM_TILE_SCATTERLIST_H
-
-#define ISA_DMA_THRESHOLD	(~0UL)
-
 #include <asm-generic/scatterlist.h>
-
-#endif /* _ASM_TILE_SCATTERLIST_H */