移除不再使用的成员

components/drivers/include/drivers/mmcsd_core.h

@@ -33,7 +33,6 @@ struct rt_mmcsd_data
     rt_uint32_t  blksize;
     rt_uint32_t  blks;
     rt_uint32_t  *buf;
-    void *dma_addr;
     rt_int32_t  err;
     rt_uint32_t  flags;
 #define DATA_DIR_WRITE  (1 << 0)