ARM: tegra: add Mic Jack to Beaver device tree

This enables the microphone input jack, and hence allows audio to be
captured as well as played back.
Signed-off-by: Stephen Warren <swarren@nvidia.com>

arch/arm/boot/dts/tegra30-beaver.dts

@@ -473,7 +473,9 @@ sound {
 
 		nvidia,audio-routing =
 			"Headphones", "HPOR",
-			"Headphones", "HPOL";
+			"Headphones", "HPOL",
+			"Mic Jack", "MICBIAS1",
+			"IN2P", "Mic Jack";
 
 		nvidia,i2s-controller = <&tegra_i2s1>;
 		nvidia,audio-codec = <&rt5640>;