net/mlx5e: Fix compilation error in TLS code

In the cited patch below, the Kconfig flags combination of:
CONFIG_MLX5_FPGA is not set
CONFIG_MLX5_TLS=y
CONFIG_MLX5_EN_TLS=y

leads to the compilation error:

./include/linux/mlx5/device.h:61:39: error: invalid application of
sizeof to incomplete type struct mlx5_ifc_tls_flow_bits.

Fix it.

Fixes: 90687e1a9a50 ("net/mlx5: Kconfig, Better organize compilation flags")
Signed-off-by: NTariq Toukan <tariqt@mellanox.com>
Signed-off-by: NSaeed Mahameed <saeedm@mellanox.com>
CC: Mao Wenan <maowenan@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx5/core/accel/tls.h

@@ -81,7 +81,6 @@ mlx5e_ktls_type_check(struct mlx5_core_dev *mdev,
 		      struct tls_crypto_info *crypto_info) { return false; }
 #endif
 
-#ifdef CONFIG_MLX5_FPGA_TLS
 enum {
 	MLX5_ACCEL_TLS_TX = BIT(0),
 	MLX5_ACCEL_TLS_RX = BIT(1),
@@ -103,6 +102,7 @@ struct mlx5_ifc_tls_flow_bits {
 	u8         reserved_at_2[0x1e];
 };
 
+#ifdef CONFIG_MLX5_FPGA_TLS
 int mlx5_accel_tls_add_flow(struct mlx5_core_dev *mdev, void *flow,
 			    struct tls_crypto_info *crypto_info,
 			    u32 start_offload_tcp_sn, u32 *p_swid,