memblock, x86: Make ARCH_DISCARD_MEMBLOCK a config option

memblock, x86: Make ARCH_DISCARD_MEMBLOCK a config option

From 6839454ae63f1eb21e515c10229ca95c22955fec Mon Sep 17 00:00:00 2001
From: Tejun Heo <redacted>
Date: Thu, 14 Jul 2011 11:22:17 +0200

Make ARCH_DISCARD_MEMBLOCK a config option so that it can be handled
together with other MEMBLOCK options.

Signed-off-by: Tejun Heo <redacted>
Link: http://lkml.kernel.org/r/20110714094603.GH3455@htj.dyndns.org
Cc: Yinghai Lu <redacted>
Cc: Benjamin Herrenschmidt <redacted>
Cc: Thomas Gleixner <redacted>
Cc: Ingo Molnar <redacted>
Cc: "H. Peter Anvin" <redacted>
Signed-off-by: H. Peter Anvin <redacted>