dts: arm: sun8i: h3: Enable deinterlace unit

Allwinner H3 SoC contains deinterlace unit, which can be used in
combination with VPU unit to decode and process interlaced videos.

Add a node for it.

Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>