[USBEHCI]

[USBEHCI]
- Implement ResetController and call it before setting up the controller
- Don't disable 64-bit addressing until the BIOS gives up control of the controller
- Comment out manually clearing the SMI interrupt and the BIOS owned flag by request of janderwald
- EHCI no longer hangs for me on real hardware during controller initialization

svn path=/branches/usb-bringup-trunk/; revision=55450