ARM: tegra: colibri_t20: update sound nvidia,model

Update sound nvidia,model to be more in-line with our other device
trees.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-colibri.dtsi

@@ -507,7 +507,7 @@ reg_module_3v3: regulator-module-3v3 {
 	sound {
 		compatible = "nvidia,tegra-audio-wm9712-colibri_t20",
 			     "nvidia,tegra-audio-wm9712";
-		nvidia,model = "Colibri T20 AC97 Audio";
+		nvidia,model = "Toradex Colibri T20";
 		nvidia,audio-routing =
 			"Headphone", "HPOUTL",
 			"Headphone", "HPOUTR",