Make the driver OF only as since AVR32 has been removed from the kernel,
there are only OF enabled platform using it.
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: NNicolas Ferre <nicolas.ferre@microchip.com>
Reviewed-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>