dt-bindings: usb: Add NVIDIA Tegra234 XUSB host controller binding

dt-bindings: usb: Add NVIDIA Tegra234 XUSB host controller binding

Add device-tree binding documentation for the XUSB host controller present
on Tegra234 SoC. This controller supports the USB 3.1 specification.

Signed-off-by: Wayne Chang <waynec@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230111110450.24617-2-jonathanh@nvidia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>