dt-bindings: thermal: rzg2l: 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.
Reviewed-by: Biju Das <biju.das.jz@bp.renesas.com>
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-v1-15-554061b52fbc@linaro.orgSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

Documentation/devicetree/bindings/thermal/rzg2l-thermal.yaml

@@ -13,6 +13,8 @@ description:
 maintainers:
   - Biju Das <biju.das.jz@bp.renesas.com>
 
+$ref: thermal-sensor.yaml#
+
 properties:
   compatible:
     items:
@@ -43,9 +45,8 @@ required:
   - clocks
   - power-domains
   - resets
-  - "#thermal-sensor-cells"
 
-additionalProperties: false
+unevaluatedProperties: false
 
 examples:
   - |