USB: phy: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style in
header files related to Physical Layer USB driver configuration.
For C header files Documentation/process/license-rules.rst
mandates C-like comments (opposed to C source files where
C++ style should be used).

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>
Link: https://lore.kernel.org/r/20200419123559.GA4505@nishadSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/phy/phy-fsl-usb.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 /* Copyright (C) 2007,2008 Freescale Semiconductor, Inc. */
 
 #include <linux/usb/otg-fsm.h>

drivers/usb/phy/phy-mv-usb.h

-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
  */