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/PCA9543Mux.template b/overlay_templates/PCA9543Mux.template
index 49257c4..d85a6c3 100644
--- a/overlay_templates/PCA9543Mux.template
+++ b/overlay_templates/PCA9543Mux.template
@@ -6,9 +6,9 @@
         target = <&i2c$bus>;
         __overlay__{
             status = "okay";
-            smbus_mux@$Name {
+            $Name: smbus_mux@$address {
                 compatible = "nxp,pca9543";
-                reg = <$address>;
+                reg = <0x$address>;
                 #address-cells = <1>;
                 #size-cells = <0>;
                 oemname1 = "$Name";