RDMA/rtrs: Remove unused flags parameter

flags is not used, so remove it from rtrs_post_rdma_write_imm_empty.

Link: https://lore.kernel.org/r/20210712060750.16494-6-jinpu.wang@ionos.com


Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Aleksei Marov <aleksei.marov@ionos.com>
Reviewed-by: Gioh Kim <gi-oh.kim@ionos.com>
Reviewed-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>