ARM: dts: st: add thermal property on stih410.dtsi and stih418.dtsi

"#thermal-sensor-cells" is required and missing in thermal nodes.
Add it.
Signed-off-by: Raphael Gallais-Pou <rgallaispou@gmail.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>

arch/arm/boot/dts/st/stih410.dtsi

@@ -270,6 +270,7 @@ thermal@91a0000 {
 			clock-names = "thermal";
 			clocks = <&clk_sysin>;
 			interrupts = <GIC_SPI 205 IRQ_TYPE_EDGE_RISING>;
+			#thermal-sensor-cells = <0>;
 		};
 
 		cec@94a087c {

arch/arm/boot/dts/st/stih418.dtsi

@@ -113,6 +113,7 @@ thermal@91a0000 {
 			clock-names = "thermal";
 			clocks = <&clk_sysin>;
 			interrupts = <GIC_SPI 205 IRQ_TYPE_EDGE_RISING>;
+			#thermal-sensor-cells = <0>;
 		};
 	};
 };