【增加】内部调度器配置，在开启多线程模块后，防止线程死循环卡死系统。

Signed-off-by: armink <armink.ztl@gmail.com>

port/mpconfigport.h

@@ -161,8 +161,8 @@
 
 #ifdef MICROPYTHON_USING_THREAD
 #define MICROPY_PY_THREAD           (1)
-#else
-#define MICROPY_PY_THREAD           (0)
+#define MICROPY_ENABLE_SCHEDULER    (1)
+#define MICROPY_SCHEDULER_DEPTH     (8)
 #endif /* MICROPYTHON_USING_THREAD */
 
 #ifdef MICROPYTHON_USING_USELECT