arm64: dts: renesas: ulcb-kf: Add KF HDMI output

This patch adds nodes needed to enable DRM video output over the HDMI
connector located on the Kingfisher board.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
Link: https://lore.kernel.org/r/20211225115308.2152364-1-nikita.yoush@cogentembedded.com


Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>