!1148 LoongArch: cleanup swiotlb bakcup buffer related code
Merge Pull Request from: @Hongchen_Zhang cleanup swiotlb bakcup buffer related code,not used now. Link:https://gitee.com/openeuler/kernel/pulls/1148 Reviewed-by:Jialin Zhang <zhangjialin11@huawei.com> Signed-off-by:
Jialin Zhang <zhangjialin11@huawei.com>
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