Add thermal zone node to Mediatek MT8183 dts file.

Evaluate the thermal zone every 500ms while not cooling
and every 100ms when passive cooling is performed.
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Signed-off-by: Michael Kao <michael.kao@mediatek.com>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>