treewide: Add SPDX license identifier for more missed files

Add SPDX license identifiers to all files which:

 - Have no license information of any form

 - Have MODULE_LICENCE("GPL*") inside which was used in the initial
   scan/conversion to ignore the file

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/sched/cls_tcindex.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /*
  * net/sched/cls_tcindex.c	Packet classifier for skb->tc_index
  *

net/sched/sch_atm.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* net/sched/sch_atm.c - ATM VC selection "queueing discipline" */
 
 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */

net/sched/sch_dsmark.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* net/sched/sch_dsmark.c - Differentiated Services field marker */
 
 /* Written 1998-2000 by Werner Almesberger, EPFL ICA */

net/sched/sch_hhf.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
 /* net/sched/sch_hhf.c		Heavy-Hitter Filter (HHF)
  *
  * Copyright (C) 2013 Terry Lam <vtlam@google.com>