arm64: dts: tegra210: Enable HS400

Enable HS400 signaling on Tegra210 SDMMC4 controller.
Signed-off-by: Aapo Vienamo <avienamo@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -1116,6 +1116,7 @@ sdhci@700b0600 {
 				  <&tegra_car TEGRA210_CLK_PLL_C4_OUT0>;
 		assigned-clock-parents = <&tegra_car TEGRA210_CLK_PLL_C4_OUT0>;
 		nvidia,dqs-trim = <40>;
+		mmc-hs400-1_8v;
 		status = "disabled";
 	};