ARM: tegra: Add missing DSI controller on Tegra30

Tegra30 has a DSI controller, although it is never used on any of the
devices supported by the upstream Linux kernel.

Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30.dtsi

@@ -264,6 +264,17 @@
 			reset-names = "dsi";
 			status = "disabled";
 		};
+
+		dsi@54400000 {
+			compatible = "nvidia,tegra30-dsi";
+			reg = <0x54400000 0x00040000>;
+			clocks = <&tegra_car TEGRA30_CLK_DSIB>,
+				 <&tegra_car TEGRA30_CLK_PLL_D_OUT0>;
+			clock-names = "dsi", "parent";
+			resets = <&tegra_car 84>;
+			reset-names = "dsi";
+			status = "disabled";
+		};
 	};
 
 	timer@50040600 {