RDMA/rtrs-srv: Do not signal REG_MR

stable inclusion
from stable-5.10.21
commit 73a4bde5e5808d5c4c8b37416e77e205bf34428a
bugzilla: 50609

--------------------------------

commit e8ae7ddb upstream.

We do not need to wait for REG_MR completion, so remove the
SIGNAL flag.

Fixes: 9cb83748 ("RDMA/rtrs: server: main functionality")
Link: https://lore.kernel.org/r/20201217141915.56989-18-jinpu.wang@cloud.ionos.com


Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Gioh Kim <gi-oh.kim@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Chen Jun <chenjun102@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>