ARM: dts: sun8i: a33: Add default address and size cells to the DSI node

The DSI bindings require that an address cell size of 1, and a size cell of
0. Instead of duplicating it in each and every board DTS file, let's put it
in the DTSI.

Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>