Tegra: fdt: Add/enhance sdhci (mmc) nodes for all T20 DT files

Linux dts files were used for those boards that didn't already
have sdhci info populated. Tamonten has their own dtsi file with
common sdhci nodes (sourced from Linux).

Signed-off-by: Tom Warren <twarren@nvidia.com>
Tested-by: Thierry Reding <thierry.reding@avionic-design.de>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
diff --git a/board/avionic-design/dts/tegra20-tec.dts b/board/avionic-design/dts/tegra20-tec.dts
index 04e6730..1d7cf89 100644
--- a/board/avionic-design/dts/tegra20-tec.dts
+++ b/board/avionic-design/dts/tegra20-tec.dts
@@ -8,6 +8,7 @@
 
 	aliases {
 		usb0 = "/usb@c5008000";
+		sdhci0 = "/sdhci@c8000600";
 	};
 
 	memory {