add const keyword for sensor ops

components/drivers/sensors/sensor.h

@@ -140,7 +140,7 @@ struct rt_sensor_device
     void                        *data_buf;  /* The buf of the data received */
     rt_size_t                    data_len;  /* The size of the data received */
 
-    struct rt_sensor_ops        *ops;       /* The sensor ops */
+    const struct rt_sensor_ops  *ops;       /* The sensor ops */
 
     struct rt_sensor_module     *module;    /* The sensor module */
 };
@@ -180,7 +180,7 @@ struct rt_sensor_data
         rt_int32_t           tvoc;          /* TVOC.                unit: permillage  */
         rt_int32_t           noise;         /* Noise Loudness.      unit: HZ          */
         rt_uint32_t          step;          /* Step sensor.         unit: 1           */
-    }data;
+    } data;
 };
 
 struct rt_sensor_ops