USB: c67x00: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style in
header files related to Cypress C67X00 USB Controller.
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 <[email protected]>
Signed-off-by: Nishad Kamdar <[email protected]>
Link: https://lore.kernel.org/r/20200315104022.GA3998@nishad
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: nishadkamdar

drivers/usb/c67x00/c67x00-hcd.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * c67x00-hcd.h: Cypress C67X00 USB HCD
  *

drivers/usb/c67x00/c67x00.h

@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0+
+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * c67x00.h: Cypress C67X00 USB register and field definitions
  *