arm64: dts: qcom: sc8180x: Require LOW_SVS vote for MMCX if DISPCC is on

To ensure the PLLs are getting enough power, cast a vote with DISPCC so
that MMCX is at least at LOW_SVS.

Fixes: 494dec9b ("arm64: dts: qcom: sc8180x: Add display and gpu nodes")
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20231230-topic-8180_more_fixes-v1-7-93b5c107ed43@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

arch/arm64/boot/dts/qcom/sc8180x.dtsi

@@ -3217,6 +3217,7 @@ dispcc: clock-controller@af00000 {
 				      "edp_phy_pll_link_clk",
 				      "edp_phy_pll_vco_div_clk";
 			power-domains = <&rpmhpd SC8180X_MMCX>;
+			required-opps = <&rpmhpd_opp_low_svs>;
 			#clock-cells = <1>;
 			#reset-cells = <1>;
 			#power-domain-cells = <1>;