usb: host: xhci-tegra: Add missing of_node_put() in tegra_xusb_probe()

usb: host: xhci-tegra: Add missing of_node_put() in tegra_xusb_probe()

This node pointer is returned by of_parse_phandle() with refcount
incremented in this function. of_node_put() on it before exitting
this function.

Fixes: 971ee247060d ("usb: xhci: tegra: Enable ELPG for runtime/system PM")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20210616044519.2183826-2-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>