ASoC: tegra: add ac97 host controller to device tree

Add default entry for the AC97 host controller.
Signed-off-by: NLucas Stach <dev@lynxeye.de>
Signed-off-by: NStephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra20.dtsi

@@ -207,6 +207,15 @@
 		compatible = "nvidia,tegra20-das";
 		reg = <0x70000c00 0x80>;
 	};
+	
+	tegra_ac97: ac97 {
+		compatible = "nvidia,tegra20-ac97";
+		reg = <0x70002000 0x200>;
+		interrupts = <0 81 0x04>;
+		nvidia,dma-request-selector = <&apbdma 12>;
+		clocks = <&tegra_car 3>;
+		status = "disabled";
+	};
 
 	tegra_i2s1: i2s@70002800 {
 		compatible = "nvidia,tegra20-i2s";