x86: copy x86_64 specific Kconfig symbols to Kconfig.i386

No functional changes.
A prepatory step towards full unification.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>

arch/x86/Kconfig

@@ -353,11 +353,11 @@ config GEODE_MFGPT_TIMER
 	  MFGPTs have a better resolution and max interval than the
 	  generic PIT, and are suitable for use as high-res timers.
 
+endif # X86_32
+
 config K8_NB
 	def_bool y
-	depends on AGP_AMD64
-
-endif # X86_32
+	depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
 
 source "drivers/pcmcia/Kconfig"