arm64: dts: qcom: sc7180: Add labels for cpuN-thermal nodes

Add labels to the cpuN-thermal nodes to allow board files to use
a phandle instead replicating the node hierarchy when adjusting
certain properties.

Due to the 'sustainable-power' property CPU thermal zones are
more likely to need property updates than other SC7180 zones,
hence only labels for CPU zones are added for now.
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Link: https://lore.kernel.org/r/20210108141648.1.Ia8019b8b303ca31a06752ed6ceb5c3ac50bd1d48@changeidSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

arch/arm64/boot/dts/qcom/sc7180.dtsi

@@ -3590,7 +3590,7 @@ lpass_hm: clock-controller@63000000 {
 	};
 
 	thermal-zones {
-		cpu0-thermal {
+		cpu0_thermal: cpu0-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3639,7 +3639,7 @@ map1 {
 			};
 		};
 
-		cpu1-thermal {
+		cpu1_thermal: cpu1-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3688,7 +3688,7 @@ map1 {
 			};
 		};
 
-		cpu2-thermal {
+		cpu2_thermal: cpu2-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3737,7 +3737,7 @@ map1 {
 			};
 		};
 
-		cpu3-thermal {
+		cpu3_thermal: cpu3-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3786,7 +3786,7 @@ map1 {
 			};
 		};
 
-		cpu4-thermal {
+		cpu4_thermal: cpu4-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3835,7 +3835,7 @@ map1 {
 			};
 		};
 
-		cpu5-thermal {
+		cpu5_thermal: cpu5-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3884,7 +3884,7 @@ map1 {
 			};
 		};
 
-		cpu6-thermal {
+		cpu6_thermal: cpu6-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3925,7 +3925,7 @@ map1 {
 			};
 		};
 
-		cpu7-thermal {
+		cpu7_thermal: cpu7-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -3966,7 +3966,7 @@ map1 {
 			};
 		};
 
-		cpu8-thermal {
+		cpu8_thermal: cpu8-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;
 
@@ -4007,7 +4007,7 @@ map1 {
 			};
 		};
 
-		cpu9-thermal {
+		cpu9_thermal: cpu9-thermal {
 			polling-delay-passive = <250>;
 			polling-delay = <0>;