arm64: dts: qcom: sdm845: make DP node follow the schema

Drop the #clock-cells (probably a leftover from the times before the DP
PHY split)

Fixes: eaac4e55 ("arm64: dts: qcom: sdm845: add displayport node")
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230110042126.702147-1-dmitry.baryshkov@linaro.org

arch/arm64/boot/dts/qcom/sdm845.dtsi

@@ -4534,7 +4534,6 @@ mdss_dp: displayport-controller@ae90000 {
 					 <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK>;
 				clock-names = "core_iface", "core_aux", "ctrl_link",
 					      "ctrl_link_iface", "stream_pixel";
-				#clock-cells = <1>;
 				assigned-clocks = <&dispcc DISP_CC_MDSS_DP_LINK_CLK_SRC>,
 						  <&dispcc DISP_CC_MDSS_DP_PIXEL_CLK_SRC>;
 				assigned-clock-parents = <&dp_phy 0>, <&dp_phy 1>;