RDMA/hns: Remove redundant 'use_lowmem' argument from hns_roce_init_hem_table()

mainline inclusion
from mainline-v6.1-rc1
commit 29dc0635
category: cleanup
bugzilla: https://gitee.com/openeuler/kernel/issues/I7A4LC
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=29dc063596772368aa896f293f5c5aef06381712

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As hns_roce_init_hem_table() is always called with use_lowmem
being '1', and table->lowmem is set according to that argument,
so remove table->lowmem too.

Also, as the table->lowmem is used to indicate a dma buffer
is allocated with GFP_HIGHUSER or GFP_KERNEL, and calling
dma_alloc_coherent() with GFP_KERNEL seems like a common
pattern.

Link: https://lore.kernel.org/r/20220922123315.3732205-7-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: Zhou Juan <nnuzj07170227@163.com>
(cherry picked from commit b8b5cbd4)