dt-bindings: iio: adf4350: add clk provider prop

Add properties required for providing clock to other consumers.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20240621121403.47912-1-antoniu.miclaus@analog.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/frequency/adi,adf4350.yaml

@@ -28,6 +28,12 @@ properties:
   clock-names:
     const: clkin
 
+  '#clock-cells':
+    const: 0
+
+  clock-output-names:
+    maxItems: 1
+
   gpios:
     maxItems: 1
     description: Lock detect GPIO.