arm64: dts: mt8183: Add MediaTek's peripheral configuration controller

The MediaTek's peripheral configuration controller is present on the
MT8183 SoC. Add the node for that controller.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Link: https://lore.kernel.org/r/20200625101757.101775-4-enric.balletbo@collabora.com


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