RDMA/rxe: Remove unused 'iova' parameter from rxe_mr_init_user

This one is not needed since commit 954afc5a ("RDMA/rxe:
Use members of generic struct in rxe_mr").

Signed-off-by: Guoqing Jiang <guoqing.jiang@linux.dev>
Link: https://lore.kernel.org/r/20240202124144.16033-1-guoqing.jiang@linux.dev


Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Signed-off-by: Leon Romanovsky <leon@kernel.org>