dt-bindings: phy: mtk-xs-phy: Add mt7988 compatible

Add compatible for xs-phy on mt7988.

Signed-off-by: Frank Wunderlich <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Acked-by: Krzysztof Kozlowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: frank-w

Documentation/devicetree/bindings/phy/mediatek,xsphy.yaml

@@ -49,6 +49,7 @@ properties:
       - enum:
           - mediatek,mt3611-xsphy
           - mediatek,mt3612-xsphy
+          - mediatek,mt7988-xsphy
       - const: mediatek,xsphy
 
   reg: