usb: gadget: goku_udc: remove useless cast for driver.name

pci_driver name is const char pointer, so it not useful to cast
driver_name (which is already const char).

Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Link: https://lore.kernel.org/r/1582054383-35760-9-git-send-email-clabbe@baylibre.com


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