Fix MMCONF_SUPPORT_DEFAULT for ramstage

Define at one place whether to use IO 0xcf8/0xcfc or MMIO via
MMCONF_BASE_ADDRESS for PCI configuration access funtions in ramstage.

The implementation of pci_default_config() always returned with
pci_cf8_conf1. This means any PCI configuration access that did
not target bus 0 used PCI IO config operations, if PCI MMIO config
was not explicitly requested.

Change-Id: I3b04f570fe88d022cd60dde8bb98e76bd00fe612
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/3606
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/northbridge/intel/i945/northbridge.c

@@ -185,11 +185,7 @@ static struct device_operations pci_domain_ops = {
 	.enable_resources = NULL,
 	.init             = NULL,
 	.scan_bus         = pci_domain_scan_bus,
-#if CONFIG_MMCONF_SUPPORT_DEFAULT
-	.ops_pci_bus	  = &pci_ops_mmconf,
-#else
-	.ops_pci_bus	  = &pci_cf8_conf1,
-#endif
+	.ops_pci_bus	  = pci_bus_default_ops,
 };
 
 static void mc_read_resources(device_t dev)