Fix overlay creation logic to use reg value for node names

This commit fixes device tree overlay creation logic and templates
to use reg values for node names.

Change-Id: I0945ad204c74a52a96ac283884a699e125b703fe
Signed-off-by: Jae Hyun Yoo <jae.hyun.yoo@intel.com>
diff --git a/overlay_templates/pmbus.template b/overlay_templates/pmbus.template
index b48780b..7aca62a 100644
--- a/overlay_templates/pmbus.template
+++ b/overlay_templates/pmbus.template
@@ -8,9 +8,9 @@
             #address-cells = <1>;
             #size-cells = <0>;
             status = "okay";
-            pmbus@$Name {
+            $Name: pmbus@$address {
                 compatible = "pmbus";
-                reg = <$address>;
+                reg = <0x$address>;
                 oemname1 = "$Name";
             };
         };