dt-bindings: media: Add Allwinner R40 deinterlace compatible

Allwinner R40 SoC also contains deinterlace core, compatible to H3.

Add compatible string for it.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210106181901.1324075-2-jernej.skrabec@siol.net