[kenel] add static name for rt_object

Author: mysterywolf

include/rtdef.h

@@ -398,7 +398,11 @@ typedef struct rt_slist_node rt_slist_t;                /**< Type for single lis
  */
 struct rt_object
 {
-    char       name[RT_NAME_MAX];                       /**< name of kernel object */
+#if RT_NAME_MAX == 0
+    const char *name;                                   /**< static name of kernel object */
+#else
+    char       name[RT_NAME_MAX];                       /**< dynamic name of kernel object */
+#endif
     rt_uint8_t type;                                    /**< type of kernel object */
     rt_uint8_t flag;                                    /**< flag of kernel object */