We deprecated the "num-slots" property now and plan to get
rid of it finally. Just move a step to cleanup it from DT.
Signed-off-by: NShawn Lin <shawn.lin@rock-chips.com>
Reviewed-by: NJaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: NHeiko Stuebner <heiko@sntech.de>