dt-bindings: phy: Fix the PX30 DSI PHY compatible in the example

Use the upstream compatible instead of the BSP one in the example
section of the DT bindings for this IP.

Fixes: 3817c79611 ("dt-bindings: phy: add yaml binding for rockchip,px30-dsi-dphy")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/phy/rockchip,px30-dsi-dphy.yaml

@@ -62,7 +62,7 @@ additionalProperties: false
 examples:
   - |
     dsi_dphy: phy@ff2e0000 {
-        compatible = "rockchip,px30-video-phy";
+        compatible = "rockchip,px30-dsi-dphy";
         reg = <0x0 0xff2e0000 0x0 0x10000>;
         clocks = <&pmucru 13>, <&cru 12>;
         clock-names = "ref", "pclk";