This patch basically just renames usages of CONFIG_MULTIQUAD to
CONFIG_X86_NUMAQ. The original multiquad option covered a variety
of sins, and just made a mess (my fault). After extensive community
discussion, this is the naming scheme everyone agreed to - the
CONFIG_X86_NUMAQ option already exists, we're just renaming usages
of MULTIQUAD to it, and removing the MULTIQUAD option.

Stuff that's really to do with clustered APIC mode is put under
CONFIG_CLUSTERED_APIC instead, as it's not specific to the NUMA-Q.

Note that the definitions of clustered_apic_mode are still duplicated,
so the changes appear twice.  I'm not making it worse, just haven't
fixed this one yet, will do that next.

Patch was written by Matt Dobson.