mm: define MADV_FREE for some arches

mm: define MADV_FREE for some arches

Most architectures use asm-generic, but alpha, mips, parisc, xtensa
need their own definitions.

This patch defines MADV_FREE for them so it should fix build break
for their architectures.

Maybe, I should split and feed piecies to arch maintainers but
included here for mmotm convenience.

Signed-off-by: Minchan Kim <minchan@kernel.org>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Helge Deller <deller@gmx.de>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Chris Zankel <chris@zankel.net>
Acked-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>