ARM: dts: sun8i-s3: pinecube: Fix CSI DTC warnings

Our CSI endpoint trigger some DTC warnings due to the fact that we're
having a single endpoint that doesn't need any reg property, and since
we don't have a reg property, we don't need the address-cells and
size-cells properties anymore.

Fix those

Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://lore.kernel.org/r/20210114113538.1233933-13-maxime@cerno.tech