MMCONF_SUPPORT: Consolidate resource registration

Change-Id: Id727270bff9e0288747d178c00f3d747fe223b0f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/17695
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/northbridge/intel/nehalem/Kconfig

@@ -24,6 +24,10 @@ config NORTHBRIDGE_INTEL_NEHALEM
 
 if NORTHBRIDGE_INTEL_NEHALEM
 
+config MMCONF_BUS_NUMBER
+	int
+	default 256
+
 config CBFS_SIZE
 	hex
 	default 0x100000