dt-bindings: usb: qcom,dwc3: Document X1E80100 MP controller

The X1E80100, just like its predecessors, has a Multiport controller.
This time around, 2 HS (eUSB) and 2 SS PHYs are attached.

Document it.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Konrad Dybcio <quic_kdybcio@quicinc.com>
Link: https://lore.kernel.org/r/20240820-topic-h_mp-v2-1-d88518066372@quicinc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>