usb: gadget: pch_udc: Move pch_udc_init() to satisfy kernel doc

usb: gadget: pch_udc: Move pch_udc_init() to satisfy kernel doc

Kernel doc and the content described by it shouldn't be torn apart.
Otherwise validator is not happy:

.../pch_udc.c:573: warning: expecting prototype for pch_udc_reconnect(). Prototype was for pch_udc_init() instead

Fixes: 1c575d2d2e3f ("usb: gadget: pch_udc: Fix usb/gadget/pch_udc: Fix ether gadget connect/disconnect issue")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210323153626.54908-4-andriy.shevchenko@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>