dt-bindings: iio: ti,tmp117: add optional label property

Add the support to provide an optional label like we do for ADC
channels to identify the device more easily.
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240226121234.545662-1-m.felsch@pengutronix.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/temperature/ti,tmp117.yaml

@@ -27,6 +27,9 @@ properties:
   vcc-supply:
     description: provide VCC power to the sensor.
 
+  label:
+    description: Unique name to identify which device this is.
+
 required:
   - compatible
   - reg