net/mlx5: Correct comment for legacy fields

fdb_table is used for both legacy and offloads mode.
It was incorrect to comment that fdb_table is legacy specific.
Hence, fix the comment to reflect that fdb_table is used in legacy and
offloads mode.

Fixes: 131ce701 ("net/mlx5: E-Switch, Remove redundant mc_promisc NULL check")
Signed-off-by: Parav Pandit <parav@mellanox.com>
Reviewed-by: Vu Pham <vuhuong@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

drivers/net/ethernet/mellanox/mlx5/core/eswitch.h

@@ -217,8 +217,8 @@ enum {
 struct mlx5_eswitch {
 	struct mlx5_core_dev    *dev;
 	struct mlx5_nb          nb;
-	/* legacy data structures */
 	struct mlx5_eswitch_fdb fdb_table;
+	/* legacy data structures */
 	struct hlist_head       mc_table[MLX5_L2_ADDR_HASH_SIZE];
 	struct esw_mc_addr mc_promisc;
 	/* end of legacy */