The Tegra USB port is attached an an SMSC9514; a combination USB hub
and Ethernet controller.

This change is extracted from a change in the ChromeOS 2.6.38 kernel.
Signed-off-by: NOlof Johansson <olofj@chromium.org>
Signed-off-by: NStephen Warren <swarren@nvidia.com>
Signed-off-by: NOlof Johansson <olof@lixom.net>