dt-bindings: phy: qcom,qmp-usb: add missing qcom,sc7180-qmp-usb3-phy schema

The "qcom,sc7180-qmp-usb3-phy" compatible is apparently used to describe
a combo PHY where only the USB part is used. Specifically, only a single
reset is used.

Fixes: 4ad7d7ee ("dt-bindings: phy: qcom,qmp-usb3-dp: Add support for SC7180")
Fixes: 94c34600

 ("dt-bindings: phy: qcom,qmp-usb3-dp-phy: move usb3 compatibles back to qcom,qmp-phy.yaml")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220830112923.3725-23-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>