x86/Kconfig: Deprecate DISCONTIGMEM support for 32-bit x86

Mel Gorman says:

  "32-bit NUMA systems should be non-existent in practice.  The last NUMA
   system I'm aware of that was both NUMA and 32-bit only died somewhere
   between 2004 and 2007. If someone is running a 64-bit capable system in
   32-bit mode with NUMA, they really are just punishing themselves for fun."

Mark DISCONTIGMEM broken for now as suggested by Christoph Hellwig,
and (hopefully) remove it in a couple of releases.

Suggested-by: Christoph Hellwig <[email protected]>
Signed-off-by: Mike Rapoport <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

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