arm64: dts: allwinner: a64: Add deinterlace core node

A64 contains deinterlace core, compatible to the one found in H3.
It can be used in combination with VPU unit to decode and process
interlaced videos.

Add a node for it.

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