usb: dwc3: dwc3-octeon: Add SPDX header and copyright

Assign copyright to indicate driver rewrite is done for RACOM s.r.o.
As David no longer works for Marvell (Cavium), I'm to blame for breakage.

Signed-off-by: Ladislav Michl <ladis@linux-mips.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Acked-by: David Daney <daviddaney@microsoft.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/ZMeAAYx6Z3hlQBNQ@lenoch


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>