uboot-phytec

tegra: usb: various small cleanups

Remove unneeded headers, function prototype and stale comment, that
doesn't match the actual codebase anymore.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>