qcacmn: Update the LF copyright years as 2018-2019

Previous commit Ia767643b51ffc780258e1d2fd0cd6a8a9e222ae2 wrongly
updated LF copyright years to 2019, keep the LF copyright years
as 2018-2019.

Change-Id: I214555e7deeea2fa3ab3a55af4c868538d5dd72f
CRs-Fixed: 2464759

os_if/linux/ftm/inc/wlan_ioctl_ftm.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the

os_if/linux/ftm/src/wlan_ioctl_ftm.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the