dt-bindings: phy: imx8mq-usb: correct reference to usb-switch.yaml

dt-bindings: phy: imx8mq-usb: correct reference to usb-switch.yaml

The i.MX95 usb-phy can work with or without orientation-switch. With
current setting, if usb-phy works without orientation-switch, the
dt-schema check will show below error:

phy@4c1f0040: 'oneOf' conditional failed, one must be fixed:
        'port' is a required property
        'ports' is a required property
        from schema $id: http://devicetree.org/schemas/phy/fsl,imx8mq-usb-phy.yaml#

This will correct the behavior of referring to usb-switch.yaml.

Signed-off-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/20241119105017.917833-1-xu.yang_2@nxp.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>