and using OSAL for task-base demo - fix ehci error with XFER_COMPLETE callback to usbh_isr, TD need to be freed & unlink before invoking callback - fix bug in usbh.c set device state to CONFIGURED right after SET_CONFIGURE control xfer
hack: add delay before the very first xfer when enumerating (finalize later after reading USB 2.0 specs)
- add mouse app to mount mouse interface