USB: typec: add SPDX identifiers to some files

Due to these typec files being moved into the drivers/usb/ directory in
this tree, they missed the larger "add SPDX tags to all files" work.  So
add the correct SPDX license tag, based on the license text in the file
itself.

The SPDX identifier is a legally binding shorthand, which can be used
instead of the full boiler plate text.

Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Yueyao Zhu <yueyao.zhu@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Cc: Philippe Ombredanne <pombredanne@nexb.com>
Acked-by: NHeikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: NRui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/fusb302/fusb302.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2016-2017 Google, Inc
  *

drivers/usb/typec/fusb302/fusb302_reg.h

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2016-2017 Google, Inc
  *

drivers/usb/typec/tcpm.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright 2015-2017 Google, Inc
  *

drivers/usb/typec/tps6598x.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Driver for TI TPS6598x USB Power Delivery controller family
  *

drivers/usb/typec/ucsi/trace.c

+// SPDX-License-Identifier: GPL-2.0
 #define CREATE_TRACE_POINTS
 #include "trace.h"