ARM: dts: exynos: Fix DTC unit name warnings in cros-adc-thermistors

Fix following DTC warnings in cros-adc-thermistors:

Warning (unit_address_vs_reg): Node /adc@12D10000/ncp15wb473@3 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /adc@12D10000/ncp15wb473@4 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /adc@12D10000/ncp15wb473@5 has a unit name, but no reg property
Warning (unit_address_vs_reg): Node /adc@12D10000/ncp15wb473@6 has a unit name, but no reg property
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>

arch/arm/boot/dts/cros-adc-thermistors.dtsi

@@ -13,28 +13,28 @@
 */
 
 &adc {
-	ncp15wb473@3 {
+	thermistor3 {
 		compatible = "murata,ncp15wb473";
 		pullup-uv = <1800000>;
 		pullup-ohm = <47000>;
 		pulldown-ohm = <0>;
 		io-channels = <&adc 3>;
 	};
-	ncp15wb473@4 {
+	thermistor4 {
 		compatible = "murata,ncp15wb473";
 		pullup-uv = <1800000>;
 		pullup-ohm = <47000>;
 		pulldown-ohm = <0>;
 		io-channels = <&adc 4>;
 	};
-	ncp15wb473@5 {
+	thermistor5 {
 		compatible = "murata,ncp15wb473";
 		pullup-uv = <1800000>;
 		pullup-ohm = <47000>;
 		pulldown-ohm = <0>;
 		io-channels = <&adc 5>;
 	};
-	ncp15wb473@6 {
+	thermistor6 {
 		compatible = "murata,ncp15wb473";
 		pullup-uv = <1800000>;
 		pullup-ohm = <47000>;