arm64: dts: qcom: sc8180x: Fix eDP PHY power-domains

The (e)DP PHYs are powered by the MX line, not through the MDSS GDSC.
Fix that up.

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-v1-5-93b5c107ed43@linaro.orgSigned-off-by: Bjorn Andersson <andersson@kernel.org>

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

@@ -3193,7 +3193,7 @@ edp_phy: phy@aec2a00 {
 				 <&dispcc DISP_CC_MDSS_AHB_CLK>;
 			clock-names = "aux", "cfg_ahb";
 
-			power-domains = <&dispcc MDSS_GDSC>;
+			power-domains = <&rpmhpd SC8180X_MX>;
 
 			#clock-cells = <1>;
 			#phy-cells = <0>;