lantiq: enable cpu temp driver for more tested boards

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

target/linux/lantiq/dts/P2812HNUFX.dtsi

@@ -15,6 +15,10 @@
 		};
 	};
 
+	cputemp@0 {
+		compatible = "lantiq,cputemp";
+	};
+
 	memory@0 {
 		reg = <0x0 0x8000000>;
 	};

target/linux/lantiq/dts/VGV7519.dtsi

@@ -21,7 +21,11 @@
 	memory@0 {
 		reg = <0x0 0x4000000>;
 	};
-	
+
+	cputemp@0 {
+		compatible = "lantiq,cputemp";
+	};
+
 	fpi@10000000 {
 		localbus@0 {
 			nor-boot@0 {