clocksource/drivers/lpc32xx: Convert to SPDX identifier

The license information clearly states GPL version 2 only. The extra text
which excludes warranties is an excerpt of the corresponding GPLv2 clause
11.

So the SPDX identifier covers it completely.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Joachim Eastwood <manabian@gmail.com>
Cc: Vladimir Zapolskiy <vz@mleia.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-arm-kernel@lists.infradead.org
Acked-by: Vladimir Zapolskiy <vz@mleia.com>
Link: https://lore.kernel.org/r/20220510171254.717233312@linutronix.deSigned-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/timer-lpc32xx.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Clocksource driver for NXP LPC32xx/18xx/43xx timer
  *
@@ -6,11 +7,6 @@
  * Based on:
  * time-efm32 Copyright (C) 2013 Pengutronix
  * mach-lpc32xx/timer.c Copyright (C) 2009 - 2010 NXP Semiconductors
- *
- * This file is licensed under the terms of the GNU General Public
- * License version 2. This program is licensed "as is" without any
- * warranty of any kind, whether express or implied.
- *
  */
 
 #define pr_fmt(fmt) "%s: " fmt, __func__