dt-bindings: display/msm: Add SM6375 DSI PHY

SM6375 has a single 7nm DSI PHY. Document it.
Signed-off-by: NKonrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/518509/
Link: https://lore.kernel.org/r/20230116114059.346327-1-konrad.dybcio@linaro.orgSigned-off-by: NDmitry Baryshkov <dmitry.baryshkov@linaro.org>

Documentation/devicetree/bindings/display/msm/dsi-phy-7nm.yaml

@@ -18,6 +18,7 @@ properties:
       - qcom,dsi-phy-7nm
       - qcom,dsi-phy-7nm-8150
       - qcom,sc7280-dsi-phy-7nm
+      - qcom,sm6375-dsi-phy-7nm
       - qcom,sm8350-dsi-phy-5nm
       - qcom,sm8450-dsi-phy-5nm
       - qcom,sm8550-dsi-phy-4nm