arm64: tegra: Enable DP support on Jetson TX2

If equipped with an E3320 display module, Jetson TX2 can support
DisplayPort.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186-p2771-0000.dts

@@ -253,10 +253,14 @@ dsi@15300000 {
 			status = "disabled";
 		};
 
+		/* DP on E3320 */
 		sor@15540000 {
-			status = "disabled";
+			status = "okay";
+
+			avdd-io-hdmi-dp-supply = <&vdd_hdmi_1v05>;
+			vdd-hdmi-dp-pll = <&vdd_1v8_ap>;
 
-			nvidia,dpaux = <&dpaux1>;
+			nvidia,dpaux = <&dpaux>;
 		};
 
 		sor@15580000 {