intel/fsp_rangeley: Fix regression on MMCONF_SUPPORT

Following commit did not move this selection to northbridge:
  bac0fad Remove explicit select MMCONF_SUPPORT

Change-Id: I5f3c429dfd160eb439f396db2baf0ecf280022fd
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17653
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

src/northbridge/intel/fsp_rangeley/Kconfig

@@ -17,6 +17,7 @@
 config NORTHBRIDGE_INTEL_FSP_RANGELEY
 	bool
 	select CPU_INTEL_FSP_MODEL_406DX
+	select MMCONF_SUPPORT
 
 if NORTHBRIDGE_INTEL_FSP_RANGELEY