arm64: dts: tegra186: Enable HS400

Enable HS400 signaling on Tegra186 SDMMC4 controller.
Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra186.dtsi

@@ -314,6 +314,7 @@ sdmmc4: sdhci@3460000 {
 		nvidia,default-tap = <0x5>;
 		nvidia,default-trim = <0x9>;
 		nvidia,dqs-trim = <63>;
+		mmc-hs400-1_8v;
 		status = "disabled";
 	};