dt-bindings: thermal: add binding document for mt8183 thermal controller

This patch adds binding document for mt8183 thermal controller.
Signed-off-by: Michael Kao <michael.kao@mediatek.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>

Documentation/devicetree/bindings/thermal/mediatek-thermal.txt

@@ -13,6 +13,7 @@ Required properties:
   - "mediatek,mt2701-thermal" : For MT2701 family of SoCs
   - "mediatek,mt2712-thermal" : For MT2712 family of SoCs
   - "mediatek,mt7622-thermal" : For MT7622 SoC
+  - "mediatek,mt8183-thermal" : For MT8183 family of SoCs
 - reg: Address range of the thermal controller
 - interrupts: IRQ for the thermal controller
 - clocks, clock-names: Clocks needed for the thermal controller. required