[usb/usbehci]

[usb/usbehci]
- Fix flags settings for PortStatus and PortChange so that the correct flags are set when hub driver sets/requests them.
- Use FastMutex to protect access to async queue and frame list.
- For USB CONFIG DESC, Check the output buffer size before attempting to write all configuration descriptors.
- Fix a bug that caused bmRequestType to be incorret value when requesting configuration and string descriptors.
- Modify some debugging to make it easier to see debug messages from usbhub driver.

svn path=/trunk/; revision=48704