{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>
diff --git a/src/soc/samsung/exynos5250/cpu.c b/src/soc/samsung/exynos5250/cpu.c
index b8b88d7..60fa55a 100644
--- a/src/soc/samsung/exynos5250/cpu.c
+++ b/src/soc/samsung/exynos5250/cpu.c
@@ -129,13 +129,9 @@
 			cpu_id, get_arm_clk() / (1024*1024));
 }
 
-static void cpu_noop(device_t dev)
-{
-}
-
 static struct device_operations cpu_ops = {
-	.read_resources   = cpu_noop,
-	.set_resources    = cpu_noop,
+	.read_resources   = DEVICE_NOOP,
+	.set_resources    = DEVICE_NOOP,
 	.enable_resources = cpu_enable,
 	.init             = cpu_init,
 	.scan_bus         = 0,