Like any other set command, require admin permissions to do it.

Cc: stable@vger.kernel.org
Fixes: 2b34c558 ("RDMA/core: Add command to set ib_core device net namspace sharing mode")
Link: https://lore.kernel.org/r/75d329fdd7381b52cbdf87910bef16c9965abb1f.1696443438.git.leon@kernel.orgReviewed-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>