ARM: dts: sunxi: h2-plus-bananapi-m2-zero: Add HDMI out

Add HDMI out, including the display engine, to the BananaPi
M2 Zero.

Signed-off-by: Pieter Beers <pjbrs@floorenpj.xs4all.nl>
Reviewed-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20210304191456.2895-2-pjbrs@floorenpj.xs4all.nl