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-medcom-wide.dts b/board/avionic-design/dts/tegra20-medcom-wide.dts
index 2acfbc1..a9a07f9 100644
--- a/board/avionic-design/dts/tegra20-medcom-wide.dts
+++ b/board/avionic-design/dts/tegra20-medcom-wide.dts
@@ -8,6 +8,7 @@
 
 	aliases {
 		usb0 = "/usb@c5008000";
+		sdhci0 = "/sdhci@c8000600";
 	};
 
 	memory {