svcrdma: Add proper SPDX tags for NetApp-contributed source

Signed-off-by: NChuck Lever <chuck.lever@oracle.com>
Signed-off-by: NJ. Bruce Fields <bfields@redhat.com>

include/linux/sunrpc/svc_rdma.h

+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
 /*
  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  *

net/sunrpc/xprtrdma/svc_rdma.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (c) 2005-2006 Network Appliance, Inc. All rights reserved.
  *

net/sunrpc/xprtrdma/svc_rdma_recvfrom.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (c) 2016, 2017 Oracle. All rights reserved.
  * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.

net/sunrpc/xprtrdma/svc_rdma_sendto.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (c) 2016 Oracle. All rights reserved.
  * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.

net/sunrpc/xprtrdma/svc_rdma_transport.c

+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
 /*
  * Copyright (c) 2014 Open Grid Computing, Inc. All rights reserved.
  * Copyright (c) 2005-2007 Network Appliance, Inc. All rights reserved.