usb: chipidea: tegra: Stop managing PHY's power

Tegra's USB PHY driver now provides generic PHY init/shutdown callbacks
and thus the custom PHY management could be removed from Tegra-specific
part of the ChipIdea driver.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20200106013416.9604-18-digetx@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>