{cpu,soc}: Use DEVICE_NOOP macro over dummy symbol

Change-Id: Iaf2b2873bd1c52d7f936bd9b483e194a0872a626
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7285
Tested-by: build bot (Jenkins)
Reviewed-by: Bruce Griffith <Bruce.Griffith@se-eng.com>

src/soc/intel/broadwell/chip.c

@@ -36,12 +36,10 @@ static struct device_operations pci_domain_ops = {
 	.ops_pci_bus      = &pci_ops_mmconf,
 };
 
-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             = &broadwell_init_cpus,
 };