[USBOHCI]

[USBOHCI]
- Set up periodic threshold (90 %)
- Add function to retrieve interrupt endpoints
- Add function to retrieve specific descriptors from interface. These are used by HID devices such as mice / keyboards
- Add function to retrieve interrupt interval
- Enqueue all endpoint descriptors at the end of the associated queue
- Only notify hardware of insertion when it is an bulk / control request
- Scan interrupt endpoint list to find the completed transfer descriptor
- Add debugging function to print out linked endpoint descriptors
- Interrupt transfers are now implemented.
- Tested in Windows XP SP3 + Vbox 4.04 + Microsoft 5-Button Mouse. The HID mouse installs, initializes and starts up. Unfortunately the mouse does not work as expected yet

svn path=/branches/usb-bringup/; revision=51922