staging: netlogic: Add SPDX-License-Identifier tag at the top

Adds the SPDX GPL-2.0 or BSD-2-clause license identifier,
which solves the checkpatch.pl warnings: "WARNING: Missing
or malformed SPDX-License-Identifier tag in line 1".
Signed-off-by: Bhagyashri Dighole <digholebhagyashri@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/netlogic/platform_net.c

+// SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
 /*
  * Copyright (c) 2003-2012 Broadcom Corporation
  * All Rights Reserved

drivers/staging/netlogic/platform_net.h

-/*
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+ *
  * Copyright (c) 2003-2012 Broadcom Corporation
  * All Rights Reserved
  *

drivers/staging/netlogic/xlr_net.c

+// SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
 /*
  * Copyright (c) 2003-2012 Broadcom Corporation
  * All Rights Reserved

drivers/staging/netlogic/xlr_net.h

-/*
+/* SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+ *
  * Copyright (c) 2003-2012 Broadcom Corporation
  * All Rights Reserved
  *