[USB\USBEHCI]

[USB\USBEHCI]
- For common buffer memory, only allocate one page and allocate more as needed. This implementation will most likely be replaced with janderwalds.
- Use a safecount while attempting to stop and start the controller, so that an error can be displayed vice doing endless loop for controllers that are misbehaving.
- Reorganize a few structuers and remove members of structures that are not used.
- Add comments for some of the DirectCall Interface Functions.
Change 2 of 3.

svn path=/trunk/; revision=51326