dt-bindings: thermal: Use generic ADC node name in examples

Update the examples to reflect a future requirement for the generic
`channel` node name on ADC channel nodes, while conveying the board name
of the channel in a label instead.

Signed-off-by: Marijn Suijten <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Daniel Lezcano <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm-hc.yaml

···
             #size-cells = <0>;
             #io-channel-cells = <1>;
 
-            /* Other propreties are omitted */
-            adc-chan@4c {
+            /* Other properties are omitted */
+            channel@4c {
                 reg = <ADC5_XO_THERM_100K_PU>;
             };
         };

Documentation/devicetree/bindings/thermal/qcom-spmi-adc-tm5.yaml

···
             #io-channel-cells = <1>;
 
             /* Other properties are omitted */
-            conn-therm@4f {
+            channel@4f {
                 reg = <ADC5_AMUX_THM3_100K_PU>;
                 qcom,ratiometric;
                 qcom,hw-settle-time = <200>;
+                label = "conn_therm";
             };
         };
 
···
             #io-channel-cells = <1>;
 
             /* Other properties are omitted */
-            xo-therm@44 {
+            channel@44 {
                 reg = <PMK8350_ADC7_AMUX_THM1_100K_PU>;
                 qcom,ratiometric;
                 qcom,hw-settle-time = <200>;
+                label = "xo_therm";
             };
 
-            conn-therm@147 {
+            channel@147 {
                 reg = <PM8350_ADC7_AMUX_THM4_100K_PU(1)>;
                 qcom,ratiometric;
                 qcom,hw-settle-time = <200>;
+                label = "conn_therm";
             };
         };