IB/iser: Remove unused declaration in header file

IB/iser: Remove unused declaration in header file

The definition of iser_finalize_rdma_unaligned_sg() has been removed
since commit dd0107a08996 ("IB/iser: set block queue_virt_boundary").
Let's remove the unused declaration in header file.

Signed-off-by: Zhang Zekun <zhangzekun11@huawei.com>
Link: https://patch.msgid.link/20240909121408.80079-2-zhangzekun11@huawei.com
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>