arm64: dts: mediatek: mt8173: Add gce-client-reg to display od/ufo

In order to use CMDQ commands on these two IPs, we need to declare
the appropriate mediatek,gce-client-reg for them.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20211104135254.580257-1-angelogioacchino.delregno@collabora.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>