[Kernel] Use stream mode to open console device.

src/kservice.c

@@ -1073,7 +1073,7 @@ rt_device_t rt_console_set_device(const char *name)
 
         /* set new console device */
         _console_device = new;
-        rt_device_open(_console_device, RT_DEVICE_OFLAG_RDWR);
+        rt_device_open(_console_device, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_STREAM);
     }
 
     return old;