RDMA/hns: Remove redundant 'bt_level' for hem_list_alloc_item()

mainline inclusion
from mainline-v6.1-rc1
commit be1eeb66
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I7UVH7
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=be1eeb667eb748391b1c8158678fe4d892187793

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The 'bt_level' parameter is not used in hem_list_alloc_item(),
so remove it.

Link: https://lore.kernel.org/r/20220922123315.3732205-6-xuhaoyue1@hisilicon.com


Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
Signed-off-by: Haoyue Xu <xuhaoyue1@hisilicon.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Juan Zhou <zhoujuan51@h-partners.com>