USB 3.1 support

Hi Bin, Stefan,

Is the U-Boot USB support compatible with USB 3.1 or does this need to be added? The SoC I'm working on (CN106XX) includes USB 3.1 support. I have not yet tried U-Boot on this chip but will shortly. If not, are there any branches with USB 3.1 changes or are no changes required?

Best Regards,

-Aaron Williams