IB/mlx5: Fix ABI alignment to 64 bit

Struct mlx5_ib_striding_rq_caps was not aligned to 64 bit as
it should have been. Add a 32 bit reserved field.

Fixes: b4f34597 ('IB/mlx5: Expose multi-packet RQ capabilities')
Signed-off-by: Noa Osherovich <noaos@mellanox.com>
Reviewed-by: Yishai Hadas <yishaih@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>

include/uapi/rdma/mlx5-abi.h

@@ -202,6 +202,7 @@ struct mlx5_ib_striding_rq_caps {
 	 * supported_qpts |= 1 << IB_QPT_RAW_PACKET
 	 */
 	__u32 supported_qpts;
+	__u32 reserved;
 };
 
 enum mlx5_ib_query_dev_resp_flags {