RDMA/mlx5: Fix link status down event for MPV

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: 379013776222 ("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>