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 <victor.liu@nxp.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20250707-dt-bindings-phy-mixel-mipi-dsi-phy-allow-assign-clock-properties-v1-1-5e34b257e1ef@nxp.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>