Thermal: Fix DEFAULT_THERMAL_GOVERNOR

Fix DEFAULT_THERMAL_GOVERNOR to be consistant with the
default governor selected in kernel config file.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/step_wise.c b/drivers/thermal/step_wise.c
index 1242cff..0cd5e9f 100644
--- a/drivers/thermal/step_wise.c
+++ b/drivers/thermal/step_wise.c
@@ -170,7 +170,7 @@
 }
 
 static struct thermal_governor thermal_gov_step_wise = {
-	.name		= DEFAULT_THERMAL_GOVERNOR,
+	.name		= "step_wise",
 	.throttle	= step_wise_throttle,
 	.owner		= THIS_MODULE,
 };