arm64: dts: mt8173: Add GCE node

This patch adds the device node of the GCE hardware for CMDQ module.

Signed-off-by: Houlong Wei <houlong.wei@mediatek.com>
Signed-off-by: HS Liao <hs.liao@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>