USB: dwc2: Use the correct style for SPDX License Identifier

USB: dwc2: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style in
header files related to DesignWare USB2 DRD Core Support.
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>
Acked-by: Minas Harutyunyan <hminas@synopsys.com>
Link: https://lore.kernel.org/r/20200328094828.GA5016@nishad
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>