[DM/FEATURE] Enable DMA ops for rt_device

Signed-off-by: GuEe-GUI <[email protected]>

Author: GuEe-GUI

include/rtdef.h

@@ -1367,6 +1367,9 @@ struct rt_device
     void *ofw_node;                                     /**< ofw node get from device tree */
 #endif /* RT_USING_OFW */
     void *power_domain_unit;
+#ifdef RT_USING_DMA
+    const void *dma_ops;
+#endif
 #endif /* RT_USING_DM */
 
     enum rt_device_class_type type;                     /**< device type */