change keyboard_app.c & mouse_app.c from polling API to interrupt-based (callback isr)
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
- ehci: free error TD for recovery