dt-bindings: watchdog: Support MediaTek MT8189 wdt

modify dt-binding for support mt8189 dts node of wdt

Signed-off-by: Jack Hsu <jh.hsu@mediatek.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

Author: Jack Hsu

Documentation/devicetree/bindings/watchdog/mediatek,mtk-wdt.yaml

@@ -41,6 +41,7 @@ properties:
               - mediatek,mt7623-wdt
               - mediatek,mt7629-wdt
               - mediatek,mt8173-wdt
+              - mediatek,mt8188-wdt
               - mediatek,mt8189-wdt
               - mediatek,mt8365-wdt
               - mediatek,mt8516-wdt