RDMA/hns: Remove if-else judgment statements for creating srq

Because if the value of srqwqe_buf_pg_sz is zero, npages and
ib_umem_page_count are equivalent, page_shif and PAGE_SHIFT
are equivalent in hns_roce_create_srq. Here remove it.

Signed-off-by: Wenpeng Liang <liangwenpeng@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Link: https://lore.kernel.org/r/1566393276-42555-8-git-send-email-oulijun@huawei.com


Signed-off-by: Doug Ledford <dledford@redhat.com>