usb: gadget: tegra: Reduce pad power

Program USB2 UTMI pad PD controls during port connect/disconnect.
Power down pad after disconnected to save power.

Signed-off-by: Jim Lin <jilin@nvidia.com>
Link: https://lore.kernel.org/r/20220816082353.13390-3-jilin@nvidia.com


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