[media] media: rc: nuvoton-cir: make nvt_hw_detect void

nvt_hw_detect always returns 0, therefore make it return void.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>