usb: gadget: udc: atmel: Fix indenting

Fix the fallout of the conversion to GPIO descriptors in 3df03408.
Acked-by: NLudovic Desroches <ludovic.desroches@microchip.com>
Acked-by: NNicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: NRomain Izard <romain.izard.pro@gmail.com>
Signed-off-by: NFelipe Balbi <felipe.balbi@linux.intel.com>