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/cpu/intel/socket_LGA771/Kconfig

@@ -1,7 +1,6 @@
 config CPU_INTEL_SOCKET_LGA771
 	bool
         select CPU_INTEL_MODEL_6FX
-        select CPU_INTEL_CORE2
 	select SSE2
 	select MMX
 	select AP_IN_SIPI_WAIT