RDMA/mlx5: Update SPDX tags to show proper license

Mellanox code is supposed to be OpenIB compliant code,
so let's update SPDX tags to show it.

Fixes: fc385b7a ("IB/mlx5: Add basic regiser/unregister representors code")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/mlx5/ib_rep.c

-/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
 /*
  * Copyright (c) 2018 Mellanox Technologies. All rights reserved.
  */

drivers/infiniband/hw/mlx5/ib_rep.h

-/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
+/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
 /*
  * Copyright (c) 2018 Mellanox Technologies. All rights reserved.
  */