usb: tegra: grouper: modify USB platform data structures

Modify USB structures of platform data. Based on the new
platform data structures modifying the initialization in
board files.

Bug 887361
arm: tegra: grouper: disable hotplug for usb instance 1

Kai's USB1 instance is used for modem, so disabling
the hotplug. This may not apply for grouper too, but lets
just make the files consistent for now.

Bug 989441
Bug 989400
ARM: tegra: grouper: Remove tegra_gpio_enable/disable

Removing tegra_gpio_enable and disable calls
from board files as they are supported thorugh
set direction calls in the driver

Bug 984439