dt-bindings: thermal: mediatek: Add binding documentation for MT8365 SoC

Add the binding documentation for the thermal support on MT8365 SoC.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Amjad Ouled-Ameur <aouledameur@baylibre.com>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221018-up-i350-thermal-bringup-v9-1-55a1ae14af74@baylibre.com


Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>