dt-bindings: phy: Add compatible for Mediatek MT8195

This commit adds dt-binding documentation of UFS M-Phy for Mediatek MT8195 SoC
Platform.
Signed-off-by: Seiya Wang <seiya.wang@mediatek.com>
Link: https://lore.kernel.org/r/20210316111443.3332-9-seiya.wang@mediatek.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/mediatek,ufs-phy.yaml

@@ -22,6 +22,7 @@ properties:
     pattern: "^ufs-phy@[0-9a-f]+$"
 
   compatible:
+    enum: mediatek,mt8195-ufsphy
     const: mediatek,mt8183-ufsphy
 
   reg: