arm64: dts: qcom: sc8280xp-x13s: drop sound-dai-cells from eDisplayPort

Qualcomm MDSS Embedded DisplayPort bindings do not allow
sound-dai-cells:

  sc8280xp-lenovo-thinkpad-x13s.dtb: displayport-controller@aea0000: #sound-dai-cells: False schema does not allow [[0]
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20231107103540.27353-2-krzysztof.kozlowski@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sc8280xp-lenovo-thinkpad-x13s.dts

@@ -573,6 +573,7 @@ &mdss0_dp1_out {
 
 &mdss0_dp3 {
 	compatible = "qcom,sc8280xp-edp";
+	/delete-property/ #sound-dai-cells;
 
 	data-lanes = <0 1 2 3>;