dt-bindings: iio: adc: mediatek: Add document for mt6765

Add compatible node for mt6765 auxadc
Signed-off-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Documentation/devicetree/bindings/iio/adc/mt6577_auxadc.txt

@@ -13,6 +13,7 @@ Required properties:
   - compatible: Should be one of:
     - "mediatek,mt2701-auxadc": For MT2701 family of SoCs
     - "mediatek,mt2712-auxadc": For MT2712 family of SoCs
+    - "mediatek,mt6765-auxadc": For MT6765 family of SoCs
     - "mediatek,mt7622-auxadc": For MT7622 family of SoCs
     - "mediatek,mt8173-auxadc": For MT8173 family of SoCs
     - "mediatek,mt8183-auxadc", "mediatek,mt8173-auxadc": For MT8183 family of SoCs