net/mlx5: IPSec: Fix incorrect type for spi

spi is __be32, fix that.

Fixes sparse warning:
drivers/net/ethernet/mellanox/mlx5/core/accel/ipsec.c:74:64
warning: incorrect type
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>

include/linux/mlx5/accel.h

@@ -76,7 +76,7 @@ struct aes_gcm_keymat {
 struct mlx5_accel_esp_xfrm_attrs {
 	enum mlx5_accel_esp_action action;
 	u32   esn;
-	u32   spi;
+	__be32 spi;
 	u32   seq;
 	u32   tfc_pad;
 	u32   flags;