arm64: tegra: Enable HDMI on P2894

Add regulators and enable the host1x nodes necessary to attain video
output via hdmi.

Signed-off-by: Aaron Kling <webgeek1234@gmail.com>

arch/arm64/boot/dts/nvidia/tegra210-p2894.dtsi

@@ -35,6 +35,24 @@
 		};
 	};
 
+	host1x@50000000 {
+		dpaux@54040000 {
+			status = "okay";
+		};
+
+		sor@54580000 {
+			status = "okay";
+
+			avdd-io-hdmi-dp-supply = <&max77620_ldo8>;
+			vdd-hdmi-dp-pll-supply = <&max77620_sd3>;
+			hdmi-supply = <&vdd_hdmi>;
+
+			nvidia,ddc-i2c-bus = <&hdmi_ddc>;
+			nvidia,hpd-gpio = <&gpio TEGRA_GPIO(CC, 1)
+					   GPIO_ACTIVE_LOW>;
+		};
+	};
+
 	gpu@57000000 {
 		vdd-supply = <&vdd_gpu>;
 		status = "okay";
@@ -1623,6 +1641,12 @@
 		};
 	};
 
+	/* HDMI DDC */
+	hdmi_ddc: i2c@7000c700 {
+		status = "okay";
+		clock-frequency = <100000>;
+	};
+
 	pmc@7000e400 {
 		nvidia,invert-interrupt;
 		nvidia,suspend-mode = <0>;