dt-bindings: phy-rockchip-inno-dsidphy: add compatible for rk3568

Add a compatible string for the rk3568 dsi-dphy.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20220919164616.12492-2-macroalpha82@gmail.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

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

@@ -18,6 +18,7 @@ properties:
       - rockchip,px30-dsi-dphy
       - rockchip,rk3128-dsi-dphy
       - rockchip,rk3368-dsi-dphy
+      - rockchip,rk3568-dsi-dphy
 
   reg:
     maxItems: 1