arm64: dts: rockchip: rk3568-evb: Enable VOP2 and hdmi

This enabled the VOP2 display controller along with hdmi and the
required port routes which is enough to get a picture out of the
hdmi port of the board.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Link: https://lore.kernel.org/r/20220422072841.2206452-19-s.hauer@pengutronix.de


Signed-off-by: Heiko Stuebner <heiko@sntech.de>