RDMA/hns: Refactor mtr_init_buf_cfg()

page_shift and page_cnt is only used in mtr_map_bufs(). And these
parameter could be calculated indepedently.

Strip the computation of page_shift and page_cnt from mtr_init_buf_cfg(),
reducing the number of parameters of it. This helps reducing coupling
between mtr_init_buf_cfg() and mtr_map_bufs().

Signed-off-by: Chengchang Tang <tangchengchang@huawei.com>
Signed-off-by: Junxian Huang <huangjunxian6@hisilicon.com>
Link: https://lore.kernel.org/r/20240113085935.2838701-3-huangjunxian6@hisilicon.com


Signed-off-by: Leon Romanovsky <leon@kernel.org>