dt-bindings: media: ti,cal: Fix example

The OV5640 sensor used in the example doesn't follow the binding and
omits the regulators. Add some to make the example valid.

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210901091852.479202-27-maxime@cerno.tech
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/media/ti,cal.yaml

@@ -154,7 +154,9 @@ examples:
         camera-sensor@3c {
                compatible = "ovti,ov5640";
                reg = <0x3c>;
-
+               AVDD-supply = <&reg_2p8v>;
+               DOVDD-supply = <&reg_1p8v>;
+               DVDD-supply = <&reg_1p5v>;
                clocks = <&clk_ov5640_fixed>;
                clock-names = "xclk";