create mm/Kconfig to detangle NUMA/DISCONTIG

The end goal of these particular patches is to allow us to get some small bits of global mm/ code compiled for either NUMA or DISCONTIGMEM.

Obviously, this alone doesn't justify messing with each architecture's Kconfig file. Think of the 4th patch as one example of how this new file can be used. We'll also be using it shortly for all of the page migration and memory hotplug options. It just starts to look silly when you have a patch to add the exact same Kconfig option to four or five different architectures.

Compile tested for 27 different .config configurations on 5 different architectures.

-- Dave

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