dt-bindings: phy: qcom,qmp-usb3-dp: fix bogus clock-cells property

The QMP PHY wrapper node is not a clock provider so drop the bogus
'#clock-cells' property that was added when converting to DT schema.

Fixes: 59351049

 ("dt-bindings: phy: qcom,qmp-usb3-dp: Add dt bindings for USB3 DP PHY")
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20220830112923.3725-24-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>