ARM: dts: omap: add missing unit names to bandgap nodes

This patch fixes the following DTC warnings:

"bandgap has a reg or ranges property, but no unit name"
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap34xx.dtsi

@@ -55,7 +55,7 @@ ports {
 			};
 		};
 
-		bandgap {
+		bandgap@48002524 {
 			reg = <0x48002524 0x4>;
 			compatible = "ti,omap34xx-bandgap";
 			#thermal-sensor-cells = <0>;

arch/arm/boot/dts/omap36xx.dtsi

@@ -87,7 +87,7 @@ ports {
 			};
 		};
 
-		bandgap {
+		bandgap@48002524 {
 			reg = <0x48002524 0x4>;
 			compatible = "ti,omap36xx-bandgap";
 			#thermal-sensor-cells = <0>;

arch/arm/boot/dts/omap443x.dtsi

@@ -35,7 +35,7 @@ thermal-zones {
 	};
 
 	ocp {
-		bandgap: bandgap {
+		bandgap: bandgap@4a002260 {
 			reg = <0x4a002260 0x4
 			       0x4a00232C 0x4>;
 			compatible = "ti,omap4430-bandgap";

arch/arm/boot/dts/omap4460.dtsi

@@ -40,7 +40,7 @@ thermal-zones {
 	};
 
 	ocp {
-		bandgap: bandgap {
+		bandgap: bandgap@4a002260 {
 			reg = <0x4a002260 0x4
 			       0x4a00232C 0x4
 			       0x4a002378 0x18>;