dt-bindings: phy: qcom,snps-eusb2: document the SM8650 Synopsys eUSB2 PHY

Document the Synopsys eUSB2 PHY on the SM8650 Platform by using
the SM8550 as fallback.
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231030-topic-sm8650-upstream-phy-v2-4-a543a4c4b491@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/qcom,snps-eusb2-phy.yaml

@@ -18,6 +18,7 @@ properties:
       - items:
           - enum:
               - qcom,sdx75-snps-eusb2-phy
+              - qcom,sm8650-snps-eusb2-phy
           - const: qcom,sm8550-snps-eusb2-phy
       - const: qcom,sm8550-snps-eusb2-phy