ARM: dts: msm: Use correct vreg for dsi vdd on SDM439

SDM439 uses a different dsi vdd compared to msm8937.

Change-Id: I92f0750e27b62761fbfed10676368133bafdbc88
Signed-off-by: Rashi Bindra <rbindra@codeaurora.org>
diff --git a/arch/arm64/boot/dts/qcom/msm8937-interposer-sdm439.dtsi b/arch/arm64/boot/dts/qcom/msm8937-interposer-sdm439.dtsi
index fbe5ce7..9fde72c 100644
--- a/arch/arm64/boot/dts/qcom/msm8937-interposer-sdm439.dtsi
+++ b/arch/arm64/boot/dts/qcom/msm8937-interposer-sdm439.dtsi
@@ -168,3 +168,7 @@
 		vdd-cci-supply = <&apc_vreg_corner>;
 	};
 };
+
+&mdss_dsi {
+	vdda-supply = <&pm8953_l2>;
+};