lantiq: enable cpu temp driver for selected boards

According to the author of the cpu temp driver, not all xrx200 boards
have a cpu temperature sensor. For that reason enable the sensor only
for tested boards.

Signed-off-by: Mathias Kresin <dev@kresin.me>

target/linux/lantiq/dts/BTHOMEHUBV5A.dts

@@ -22,6 +22,10 @@
 		reg = <0x0 0x8000000>;
 	};
 
+	cputemp@0 {
+		compatible = "lantiq,cputemp";
+	};
+
 	fpi@10000000 {
 		localbus@0 {
 			nand-parts@0 {

target/linux/lantiq/dts/TDW89X0.dtsi

@@ -20,6 +20,10 @@
 		reg = <0x0 0x4000000>;
 	};
 
+	cputemp@0 {
+		compatible = "lantiq,cputemp";
+	};
+
 	fpi@10000000 {
 		gpio: pinmux@E100B10 {
 			pinctrl-names = "default";

target/linux/lantiq/dts/VGV7510KW22.dtsi

@@ -21,6 +21,10 @@
 		reg = <0x0 0x4000000>;
 	};
 
+	cputemp@0 {
+		compatible = "lantiq,cputemp";
+	};
+
 	fpi@10000000 {
 		localbus@0 {
 			nor-boot@0 {