Move the power-down-control register update that powers on the PHY to
the power-on handler so that it matches the power-off handler.

Note that the power-on handler is currently always called directly
after init.
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Link: https://lore.kernel.org/r/20221017065013.19647-6-johan+linaro@kernel.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>