dt-bindings: iio: ti,tmp117: add vcc supply binding

Add the binding to specify the vcc supply. We can't make it required
since this would break the backward compatibility.
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Thomas Haemmerle <thomas.haemmerle@leica-geosystems.com>
Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.kernel.org/r/20240219131114.134607-1-m.felsch@pengutronix.deSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

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

@@ -24,9 +24,13 @@ properties:
   reg:
     maxItems: 1
 
+  vcc-supply:
+    description: provide VCC power to the sensor.
+
 required:
   - compatible
   - reg
+  - vcc-supply
 
 additionalProperties: false
 
@@ -39,5 +43,6 @@ examples:
         tmp117@48 {
              compatible = "ti,tmp117";
              reg = <0x48>;
+             vcc-supply = <&pmic_reg_3v3>;
         };
     };