osal clean up

remove OSAL_TASK_DEF, osal_task_create. Applicaton should create a task
and call tinyusb_task(). This make API consistent with NO OS.

src/common/tusb_fifo.c

@@ -48,9 +48,7 @@ static void tu_fifo_lock(tu_fifo_t *f)
 {
   if (f->mutex)
   {
-    uint32_t err;
-    (void) err;
-    osal_mutex_lock(f->mutex, OSAL_TIMEOUT_WAIT_FOREVER, &err);
+    osal_mutex_lock(f->mutex, OSAL_TIMEOUT_WAIT_FOREVER);
   }
 }