Intel cpus: apply un-written naming rules

Kconfig directives to select chip drivers for compile literally
match the chip directory names capitalized and underscored.

Note: CPU_INTEL_CORE2 was used on both model_6fx and model_1067x.

Change-Id: I8fa5ba71b14dcce79ab2a2c1c69b3bc36edbdea0
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/618
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/intel/eagleheights/devicetree.cb

@@ -65,7 +65,7 @@ chip northbridge/intel/i3100
                 end
         end
         device lapic_cluster 0 on
-                chip cpu/intel/bga956
+                chip cpu/intel/socket_BGA956
                         device lapic 0 on end
                 end
         end