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

demos/host/main.c

@@ -21,6 +21,10 @@ int main(void)
   board_init();
   tusb_init();
 
+  //------------- application task init -------------//
+  keyboard_app_init();
+  mouse_app_init();
+
   printf("reset\n");
   while (1)
   {