net: dsa: sja1105: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style
in header files related to Distributed Switch Architecture
drivers for NXP SJA1105 series Ethernet switch support.
It uses an expilict block comment for the SPDX License
Identifier.

Changes made by using a script provided by Joe Perches here:
https://lkml.org/lkml/2019/2/7/46.

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/dsa/sja1105/sja1105_ptp.h

@@ -1,5 +1,5 @@
-/* SPDX-License-Identifier: GPL-2.0
- * Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright (c) 2019, Vladimir Oltean <olteanv@gmail.com>
  */
 #ifndef _SJA1105_PTP_H
 #define _SJA1105_PTP_H