northbridge/intel: Use DEVICE_NOOP macro over dummy symbol

Change-Id: I9aeed70f72d4df260312df6e53379f1741415b65
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7287
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>
diff --git a/src/northbridge/intel/i945/northbridge.c b/src/northbridge/intel/i945/northbridge.c
index 815d4bf..91c5c82 100644
--- a/src/northbridge/intel/i945/northbridge.c
+++ b/src/northbridge/intel/i945/northbridge.c
@@ -279,14 +279,10 @@
 	initialize_cpus(dev->link_list);
 }
 
-static void cpu_bus_noop(device_t dev)
-{
-}
-
 static struct device_operations cpu_bus_ops = {
-	.read_resources   = cpu_bus_noop,
-	.set_resources    = cpu_bus_noop,
-	.enable_resources = cpu_bus_noop,
+	.read_resources   = DEVICE_NOOP,
+	.set_resources    = DEVICE_NOOP,
+	.enable_resources = DEVICE_NOOP,
 	.init             = cpu_bus_init,
 	.scan_bus         = 0,
 };