dt-bindings: phy: mixel, mipi-dsi-phy: Allow assigned-clock* properties

assigned-clock* properties can be used by default now, so allow them.

Signed-off-by: Liu Ying <[e-mail]>
Reviewed-by: Rob Herring (Arm) <[e-mail]>
Link: https://lore.kernel.org/r/20250707-dt-bindings-phy-mi[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

Documentation/devicetree/bindings/phy/mixel,mipi-dsi-phy.yaml

···
           contains:
             const: fsl,imx8qxp-mipi-dphy
     then:
-      properties:
-        assigned-clocks: false
-        assigned-clock-parents: false
-        assigned-clock-rates: false
-
       required:
         - fsl,syscon