dt-bindings: thermal: generic-adc: reference thermal-sensor schema

Device is a thermal sensor and it requires '#thermal-sensor-cells', so
reference the thermal-sensor.yaml to simplify it and bring the
common definition of '#thermal-sensor-cells' property.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240705-dt-bindings-thermal-allof-v1-5-554061b52fbc@linaro.orgSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/thermal/generic-adc-thermal.yaml

@@ -15,6 +15,8 @@ description:
   sensor resistor. The voltage read across the sensor is mapped to
   temperature using voltage-temperature lookup table.
 
+$ref: thermal-sensor.yaml#
+
 properties:
   compatible:
     const: generic-adc-thermal
@@ -44,11 +46,10 @@ properties:
 
 required:
   - compatible
-  - '#thermal-sensor-cells'
   - io-channels
   - io-channel-names
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |