XXX: x86/Kconfig: simplify NUMA config for NUMA_EMU on X86_32.

NUMA_EMU depends on NUMA.
NUMA depends on (X86_64 || (X86_32 && ( list of extended platforms))).

This forced enabling an extended platform when using numa emulation on
x86_32, which is silly.

Remoing the list of extended platforms (plus EXPERIMENTAL) results in
NUMA depending on X86_64 || X86_32, so simply remove all dependencies
from NUMA.

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>