phy: qcom-qmp-pcie-msm8996: drop start and pwrdn-ctrl abstraction

Drop the start and pwrdn-ctrl abstractions which are no longer needed
since the QMP driver split.

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20221012085002.24099-18-johan+linaro@kernel.org


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