dt-bindings: usb: switch: split out ports definition

The ports definition currently defined in the usb-switch.yaml
fits standards devices which are either recipient of altmode
muxing and orientation switching events or an element of the
USB Super Speed data lanes.

This doesn't necessarely fit combo PHYs like the Qualcomm
USB3/DP Combo which has a different ports representation.

Move the ports definition to a separate usb-switch-ports.yaml
and reference it next to the usb-switch.yaml, except for
the Qualcomm USB3/DP Combo PHY bindings.

Reported-by: Rob Herring <robh@kernel.org>
Closes: https://lore.kernel.org/all/175462129176.394940.16810637795278334342.robh@kernel.org/


Fixes: 3bad7fe2 ("dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Reference usb-switch.yaml to allow mode-switch")
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>