Xhci dbg fix

[fysnet]

The function for some of the xHCI rings was never added to the USB_DEBUGGER code.
This should now allow you to see the DATA rings as well.
Use the data=1 parameter:

  usb_debug: type=xhci, doorbell=1, event=1, data=1

[fysnet]

You can ignore the change in win32res.rc. For a reason I have yet to investigate, my Windows build won't build since it hasn't defined BX_USB_DEBUGGER yet, but at the top of the same file is:

#include "config.h"

So I will just need to find out why.

[fysnet]

Volker, you will need to add the necessary changes to the GTK file(s) you have to get this PR to work with the GTK environment.