完善驱动服务，完成简单测试

mkrtos_knl/knl/scheduler.c

@@ -47,7 +47,7 @@ void scheduler_add(sched_t *node)
     assert(node->prio >= 0);
     assert(node->prio < PRIO_MAX);
 
-    if (node->prio != sched->max_prio)
+    if (node->prio > sched->max_prio)
     {
         sched->max_prio = node->prio;
         sched->cur_sche = NULL;

mkrtos_knl/knl/thread_knl.c

@@ -84,7 +84,7 @@ static void knl_init_2(void)
             assert(obj_map_root(kobj, &init_task->obj_space, &root_factory_get()->limit, vpage_create3(KOBJ_ALL_RIGHTS, 0, i)));
         }
     }
-    init_thread->sche.prio = 2;
+    init_thread->sche.prio = 3;
     thread_ready(init_thread, FALSE);
 }
 INIT_STAGE2(knl_init_2);