dt-bindings: phy: qcom,sc8280xp-qmp-ufs-phy: fix msm899[68] power-domains

The Qualcomm MSM8996 and MSM8998 platforms don't have separate power
domain for the UFS PHY. Replace required:power-domains with the
conditional schema.

Fixes: dc5cb63 ("dt-bindings: phy: migrate QMP UFS PHY bindings to qcom,sc8280xp-qmp-ufs-phy.yaml")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240501-qcom-phy-fixes-v1-2-f1fd15c33fb3@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: lumag

Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-ufs-phy.yaml

@@ -72,7 +72,6 @@ required:
   - reg
   - clocks
   - clock-names
-  - power-domains
   - resets
   - reset-names
   - vdda-phy-supply
@@ -130,6 +129,21 @@ allOf:
             - const: ref
             - const: qref
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,msm8996-qmp-ufs-phy
+              - qcom,msm8998-qmp-ufs-phy
+    then:
+      properties:
+        power-domains:
+          false
+    else:
+      required:
+        - power-domains
+
 additionalProperties: false
 
 examples: