!813 [OLK-5.10] net/smc: backport dma sync ops optimize

Merge Pull Request from: @giree2 
 
backport dma sync ops optimize:

1. net/smc: remove redundant dma sync ops
2. net/smc: optimize for smc_sndbuf_sync_sg_for_device and smc_rmb_sync_sg_for_cpu 
 
Link:https://gitee.com/openeuler/kernel/pulls/813

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>