[USBUHCI]

[USBUHCI]
- Delay for the correct amount of time when performing a global reset and a port reset
- Loosen the loop timings a bit to allow for more time for real hardware to complete start/stop/reset
- Clear only the change bits that were set and handle both bits in the either case
- Perform a synchronous callback when the reset completes

svn path=/trunk/; revision=55832