[MIPS] emma2rh: Fix build error by header file inclusion weeding.

  CC      arch/mips/emma2rh/markeins/setup.o
In file included from arch/mips/emma2rh/markeins/setup.c:30:
include/linux/ide.h:645: error: ‘CONFIG_IDE_MAX_HWIFS’ undeclared here (not in a function)
make[1]: *** [arch/mips/emma2rh/markeins/setup.o] Error 1

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>