dt-bindings: iio: mlx90632 Add supply regulator documentation

Document the newly added vdd supply option.
Signed-off-by: Crt Mori <cmo@melexis.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220808144936.1559158-1-cmo@melexis.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/temperature/melexis,mlx90632.yaml

@@ -35,6 +35,9 @@ properties:
     maxItems: 1
     description: Default is 0x3a, but can be reprogrammed.
 
+  vdd-supply:
+    description: provide VDD power to the sensor.
+
 required:
   - compatible
   - reg
@@ -50,6 +53,7 @@ examples:
         temp-sensor@3a {
             compatible = "melexis,mlx90632";
             reg = <0x3a>;
+            vdd-supply = <&ldo4_reg>;
         };
     };
 ...