usb: gadget: udc-xilinx: Fix xudc_stop() kernel-doc format

The patch removes "driver" parameter which has been removed without
updating kernel-doc format.

Fixes: 22835b80

 ("usb: gadget: remove unnecessary 'driver' argument")
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Link: https://lore.kernel.org/r/c753b529bdcdfdd40a3cf69121527ec8c63775cb.1581505183.git.michal.simek@xilinx.com


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