video: nuc900fb: fix to pass correct device identity to request_irq()

The IRQ handler nuc900fb_irqhandler() use dev_id as a type of
struct nuc900fb_info *, so we should pass fbi as the device
identity to request_irq().

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Acked-by: Wan Zongshun <mcuos.com@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>