clk: palmas: Add a missing SPDX license header

Add the missing SPDX license header to drivers/clk/clk-palmas.c.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Link: https://lore.kernel.org/r/20210731132226.424853-1-wangborong@cdjrlc.com
[sboyd@kernel.org: Also remove boilerplate from comment]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Jason Wang

drivers/clk/clk-palmas.c

@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Clock driver for Palmas device.
  *
@@ -6,15 +7,6 @@
  *
  * Author:	Laxman Dewangan <ldewangan@nvidia.com>
  *		Peter Ujfalusi <peter.ujfalusi@ti.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation version 2.
- *
- * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
- * whether express or implied; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
  */
 
 #include <linux/clk.h>