ARM: dts: rockchip: Add HDMI out for RockPI N8/N10

This patch adds support to enable HDMI out for
N10 and N8 combinations SBCs.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Suniel Mahesh <sunil@amarulasolutions.com>
Link: https://lore.kernel.org/r/20200720110230.367985-2-jagan@amarulasolutions.com


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