RDMA/mlx5: Fix link status down event for MPV

The commit below prevented MPV from unloading correctly due to blocking
the netdev down event, allow sending the event for MPV mode to maintain
proper unload flow.

Fixes: 3790137 ("RDMA/mlx5: Handle link status event only for LAG device")
Signed-off-by: Patrisious Haddad <phaddad@nvidia.com>
Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
Link: https://patch.msgid.link/d7731478e456f61255af798a7fd4e64b006ddebb.1735567976.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

Author: PatrisiousHaddad

drivers/infiniband/hw/mlx5/main.c

@@ -242,7 +242,8 @@ static int mlx5_netdev_event(struct notifier_block *this,
 	case NETDEV_DOWN: {
 		struct net_device *upper = NULL;
 
-		if (!netif_is_lag_master(ndev) && !netif_is_lag_port(ndev))
+		if (!netif_is_lag_master(ndev) && !netif_is_lag_port(ndev) &&
+		    !mlx5_core_mp_enabled(mdev))
 			return NOTIFY_DONE;
 
 		if (mlx5_lag_is_roce(mdev) || mlx5_lag_is_sriov(mdev)) {