dt-bindings: phy: qcom,sc7180-qmp-usb3-dp-phy: Add orientation-switch as optional

orientation-switch it the standard declaration to inform the Type-C mux
layer that a remote-endpoint is capable of processing orientation change
messages.

Add as an optional since not all versions of the dp-phy currently support
the orientation-switch.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20230515133643.3621656-4-bryan.odonoghue@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/phy/qcom,sc7180-qmp-usb3-dp-phy.yaml

@@ -61,6 +61,10 @@ properties:
   power-domains:
     maxItems: 1
 
+  orientation-switch:
+    description: Flag the port as possible handler of orientation switching
+    type: boolean
+
   resets:
     items:
       - description: reset of phy block.
@@ -251,6 +255,8 @@ examples:
         vdda-phy-supply = <&vdda_usb2_ss_1p2>;
         vdda-pll-supply = <&vdda_usb2_ss_core>;
 
+        orientation-switch;
+
         usb3-phy@200 {
             reg = <0x200 0x128>,
                   <0x400 0x200>,