Well, it looks like this simple question created some confusion and I thought it was worth pointing out. Usually, I look for updated ADMX/ADML files on the Microsoft Download Center when it is a Microsoft product, but things have changed with the OneDrive Next Gen sync client for Windows 10 1709.
I am not sure if this is going to be standard practice going forward, but I had to look in the following folder on one of my Windows 10 1709 machines with the Next Gen sync client installed.
Also of importance is the removal of the OneDrive_MultiTenant.admx. I am not sure if this is something that has permanently disappeared, but this is not necessary with the Next Gen sync client since it is not applicable to Windows Server 2016.
If you want the files without going through the hoops to build a machine with the current (as of writing this article) Next Gen sync client I’ve put them over here.