arm64: dts: rockchip: enable display nodes on rk3328-roc-cc

Enable necessary nodes to get output on the hdmi port of the board.

This is a port of Heiko's patch for the rock64.

Signed-off-by: Leonidas P. Papadakos <papadakospan@gmail.com>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>