dt-bindings: arm: mediatek: mt7622-wed: add WED binding for MT7988 SoC

Introduce MT7988 SoC compatibility string in mtk_wed binding.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

Documentation/devicetree/bindings/arm/mediatek/mediatek,mt7622-wed.yaml

@@ -22,6 +22,7 @@ properties:
           - mediatek,mt7622-wed
           - mediatek,mt7981-wed
           - mediatek,mt7986-wed
+          - mediatek,mt7988-wed
       - const: syscon
 
   reg: