RDMA/rxe: Remove the duplicate assignment of mr->map_shift

mr->map_shift is set to ilog2(RXE_BUF_PER_MAP) in both rxe_mr_init() and
rxe_mr_alloc() so remove the duplicate one in rxe_mr_init().

Link: https://lore.kernel.org/r/1666855893-145-1-git-send-email-yangx.jy@fujitsu.com


Signed-off-by: Xiao Yang <yangx.jy@fujitsu.com>
Reviewed-by: Li Zhijian <lizhijian@fujitsu.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>