arm64: dts: rockchip: rename thermal subnodes for rk3399

A test with the command below gives for example this error:
/arch/arm64/boot/dts/rockchip/rk3399-evb.dt.yaml:
thermal-zones: 'cpu', 'gpu' do not match any of the regexes:
'^[a-zA-Z][a-zA-Z0-9\\-]{1,12}-thermal$', 'pinctrl-[0-9]+'

Rename Rockchip rk3399 thermal subnodes so that it ends
with "-thermal"

make ARCH=arm64 dtbs_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/
thermal/thermal-zones.yaml
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Link: https://lore.kernel.org/r/20210117150953.16475-3-jbx6244@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3399-rock960.dts

@@ -126,7 +126,7 @@ &spi4 {
 };
 
 &thermal_zones {
-	cpu_thermal: cpu {
+	cpu_thermal: cpu-thermal {
 		polling-delay-passive = <100>;
 		polling-delay = <1000>;
 		thermal-sensors = <&tsadc 0>;

arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -764,7 +764,7 @@ spi5: spi@ff200000 {
 	};
 
 	thermal_zones: thermal-zones {
-		cpu_thermal: cpu {
+		cpu_thermal: cpu-thermal {
 			polling-delay-passive = <100>;
 			polling-delay = <1000>;
 
@@ -808,7 +808,7 @@ map1 {
 			};
 		};
 
-		gpu_thermal: gpu {
+		gpu_thermal: gpu-thermal {
 			polling-delay-passive = <100>;
 			polling-delay = <1000>;