phy: qcom-qmp-pcie-msm8996: drop unused kernel doc

Drop the removed mode field from the struct qmp_phy kernel doc.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20220920073826.20811-9-johan+linaro@kernel.org


Signed-off-by: Vinod Koul <vkoul@kernel.org>