RDMA/hns: Reorganize process of setting HEM

mainline inclusion
from mainline-v5.13-rc1
commit c6f0411b
category: bugfix
bugzilla: 174002
CVE:NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c6f0411b960d0b5af35c78cf47cc8019bee00656

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Encapsulate configuring GMV base address and other type of HEM table into
two separate functions to make process of setting HEM clearer.

Link: https://lore.kernel.org/r/1616815294-13434-5-git-send-email-liweihang@huawei.com


Signed-off-by: Xi Wang <wangxi11@huawei.com>
Signed-off-by: Weihang Li <liweihang@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: wangsirong <wangsirong@huawei.com>
Reviewed-by: ChunZhi Hu <huchunzhi@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>