usb: dwc3: Resolve kernel-doc warning for Xilinx DWC3 driver

usb: dwc3: Resolve kernel-doc warning for Xilinx DWC3 driver

The kernel-doc run gave a warning for Xilinx DWC3 driver:

drivers/usb/dwc3/dwc3-xilinx.c:27: warning: expecting prototype for
dwc3(). Prototype was for XLNX_USB_PHY_RST_EN() instead

Basically it was due to an extra '*' in line:2. This patch fixes the same.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Manish Narani <manish.narani@xilinx.com>
Link: https://lore.kernel.org/r/1617904448-74611-2-git-send-email-manish.narani@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>