There are a few remaining drivers/usb/ files that do not have SPDX
identifiers in them, all of these are either Kconfig or Makefiles. Add
the correct GPL-2.0 identifier to them to make scanning tools happy.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Bug: 143059282
Change-Id: I2914396e10e0ccf51ec67290e833a82c7e90da9a
Signed-off-by: Kyle Tso <kyletso@google.com>