dt-bindings: phy: qcom,sc8280xp-qmp-usb43dp: Reference usb-switch.yaml to allow mode-switch

The QMP USB3/DP Combo PHY can work in 3 modes:
- DisplayPort Only
- USB3 Only
- USB3 + DisplayPort Combo mode

In order to switch between those modes, the PHY needs to receive
Type-C events, allow marking to the phy with the mode-switch
property in order to allow the PHY to Type-C events.

Reference usb-switch.yaml as a simpler way to allow the mode-switch
property instead of duplicating the property definition.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on Lenovo Thinkpad T14S
Link: https://lore.kernel.org/r/20250807-topic-4ln_dp_respin-v4-1-43272d6eca92@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-usb43dp-phy.yaml

@@ -73,10 +73,8 @@ properties:
     description:
       See include/dt-bindings/phy/phy-qcom-qmp.h
 
-  orientation-switch:
+  mode-switch: true
-    description:
+  orientation-switch: true
-      Flag the PHY as possible handler of USB Type-C orientation switching
-    type: boolean
 
   ports:
     $ref: /schemas/graph.yaml#/properties/ports
@@ -106,6 +104,7 @@ required:
   - "#phy-cells"
 
 allOf:
+  - $ref: /schemas/usb/usb-switch.yaml#
   - if:
       properties:
         compatible: