cpu/intel/socket_mFCPGA478/Kconfig: Add MODEL_6{9,D}X

Makefile.inc uses already model_6{9,d}x subdirs.

Change-Id: I0bfc179a83fab85e5b924751e026d906d01b3fb6
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/29613
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Marshall Dawson <marshalldawson3rd@gmail.com>

src/cpu/intel/socket_mFCPGA478/Kconfig

@@ -5,6 +5,8 @@ if CPU_INTEL_SOCKET_MFCPGA478
 
 config SOCKET_SPECIFIC_OPTIONS # dummy
 	def_bool y
+	select CPU_INTEL_MODEL_69X
+	select CPU_INTEL_MODEL_6DX
 	select CPU_INTEL_MODEL_6EX
 	select CPU_INTEL_MODEL_6FX
 	select MMX