qcacmn: qdf: Remove legacy markings

Per current guidance remove legacy markings.

Change-Id: Ia920daa3248677b9446f4203c7698cbc37648fbd
CRs-Fixed: 2230684

qdf/inc/qdf_perf.h

@@ -1,9 +1,6 @@
 /*
  * Copyright (c) 2012-2016 The Linux Foundation. All rights reserved.
  *
- * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
- *
- *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
  * above copyright notice and this permission notice appear in all
@@ -19,12 +16,6 @@
  * PERFORMANCE OF THIS SOFTWARE.
  */
 
-/*
- * This file was originally distributed by Qualcomm Atheros, Inc.
- * under proprietary terms before Copyright ownership was assigned
- * to the Linux Foundation.
- */
-
 /**
  * DOC: qdf_perf
  * This file provides OS abstraction perf API's.