x86, uv: add Kconfig dependency on NUMA for UV systems

Impact: build fix

Add Kconfig dependency on NUMA for enabling UV. Although it might
be possible to configure non-NUMA UV systems, they are unsupported
and not interesting. Much of the infrastructure for UV requires
NUMA support.
Signed-off-by: NJack Steiner <steiner@sgi.com>
LKML-Reference: <20090403203942.GA20137@sgi.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/Kconfig

@@ -354,6 +354,7 @@ config X86_UV
 	bool "SGI Ultraviolet"
 	depends on X86_64
 	depends on X86_EXTENDED_PLATFORM
+	depends on NUMA
 	select X86_X2APIC
 	---help---
 	  This option is needed in order to support SGI Ultraviolet systems.