net/mlx5: SF, Stop waiting for FW as teardown was called

When PF/VF teardown is called the driver sets the flag
MLX5_BREAK_FW_WAIT to stop waiting for FW loading and initializing. Same
should be applied to SF driver teardown to cut waiting time. On
mlx5_sf_dev_remove() set the flag before draining health WQ as recovery
flow may also wait for FW reloading while it is not relevant anymore.

Signed-off-by: Moshe Shemesh <moshe@nvidia.com>
Reviewed-by: Aya Levin <ayal@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>