[AGPGART] Delete trailing whitespace in generic routines.

Bump copyright dates whilst we're there.
Signed-off-by: Dave Jones <davej@redhat.com>

drivers/char/agp/generic.c

 /*
  * AGPGART driver.
- * Copyright (C) 2002-2003 Dave Jones.
+ * Copyright (C) 2002-2004 Dave Jones.
  * Copyright (C) 1999 Jeff Hartmann.
  * Copyright (C) 1999 Precision Insight, Inc.
  * Copyright (C) 1999 Xi Graphics, Inc.