All the lib changes you could do in one commit.

You can do this as a separate change, maybe combined with others that just do similar things.

These should have their own transfer speeds, I think.

2**10 == 1024

2**11 is 2048

You can roll this into the enum... And I'd be tempted to commit just the extra enums first by itself, since that lets you do many slivers of the change on their own as well.

Same comment.

why this change?

usb_devcap_ss_plus_descriptor ?

Do we also need to add USB_SPEED_SUPER_PLUS_X2 ?