drm: renesas: rz-du: Switch to new VSP API

drm: renesas: rz-du: Switch to new VSP API

The vsp1_du_setup_lif() function is deprecated. Use the new
vsp1_du_enable() and vsp1_du_disable() functions instead.

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Biju Das <biju.das.jz@bp.renesas.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://patch.msgid.link/20260511235637.3468558-5-laurent.pinchart+renesas@ideasonboard.com
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>