net/mlx5e: Fix eswitch debug print of max fdb flow

The value is already the calculation so remove the log prefix.

Fixes: e52c2802 ("net/mlx5: E-Switch, Add chains and priorities")
Signed-off-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Eli Britstein <elibr@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>