drv->set_use_inc and drv->set_use_dec are already optional so we can
remove all dummy functions.
Signed-off-by: NDavid Härdeman <david@hardeman.nu>
Signed-off-by: NSean Young <sean@mess.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>