Welcome to INTEL forum. Intel doesn’t provide USB IP solution and it’s supported by 3rd party design partner such as below SLS company
I am Pritesh from SLS. We do have Demonstration as well as reference design available for USB 3.1 Device IP. Please visit above link to get more information about IP core. If you are interested to get more information or to evaluate the IP core, write us at firstname.lastname@example.org.
You can also write your thoughts here.