dt-bindings: iio: light: adps9300: Add missing vdd-supply

All devices covered by the binding have a vdd supply.
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Subhajit Ghosh <subhajit.ghosh@tweaklogic.com>
Link: https://lore.kernel.org/r/20240309105031.10313-3-subhajit.ghosh@tweaklogic.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/light/avago,apds9300.yaml

@@ -25,6 +25,8 @@ properties:
   interrupts:
     maxItems: 1
 
+  vdd-supply: true
+
 additionalProperties: false
 
 required:
@@ -42,6 +44,7 @@ examples:
             reg = <0x39>;
             interrupt-parent = <&gpio2>;
             interrupts = <29 8>;
+            vdd-supply = <&regulator_3v3>;
         };
     };
 ...