ARM: dts: sunxi: Enable thermal sensor support for RTP on sun[457]i

Now that the resistive touchpanel driver supports thermal sensors,
add the "#thermal-sensor-cells" property as required by the thermal
framework.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Eduardo Valentin <edubezval@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun4i-a10.dtsi

@@ -734,6 +734,7 @@ rtp: rtp@01c25000 {
 			compatible = "allwinner,sun4i-a10-ts";
 			reg = <0x01c25000 0x100>;
 			interrupts = <29>;
+			#thermal-sensor-cells = <0>;
 		};
 
 		uart0: serial@01c28000 {

arch/arm/boot/dts/sun5i-a10s.dtsi

@@ -548,6 +548,7 @@ rtp: rtp@01c25000 {
 			compatible = "allwinner,sun4i-a10-ts";
 			reg = <0x01c25000 0x100>;
 			interrupts = <29>;
+			#thermal-sensor-cells = <0>;
 		};
 
 		uart0: serial@01c28000 {

arch/arm/boot/dts/sun5i-a13.dtsi

@@ -482,6 +482,7 @@ rtp: rtp@01c25000 {
 			compatible = "allwinner,sun4i-a10-ts";
 			reg = <0x01c25000 0x100>;
 			interrupts = <29>;
+			#thermal-sensor-cells = <0>;
 		};
 
 		uart1: serial@01c28400 {

arch/arm/boot/dts/sun7i-a20.dtsi

@@ -942,6 +942,7 @@ rtp: rtp@01c25000 {
 			compatible = "allwinner,sun4i-a10-ts";
 			reg = <0x01c25000 0x100>;
 			interrupts = <GIC_SPI 29 IRQ_TYPE_LEVEL_HIGH>;
+			#thermal-sensor-cells = <0>;
 		};
 
 		uart0: serial@01c28000 {