Drop the unused and incomplete runtime PM implementation, which wasReviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
only used by USB PHYs before splitting the QMP driver.
Note that the runtime PM was never disabled (and state restored) on
driver unbind.
This effectively reverts commit ac0d239936bd ("phy: qcom-qmp: Add
support for runtime PM").
Signed-off-by: Johan Hovold <johan+linaro@xxxxxxxxxx>