tegra2: Add Avionic Design Medcom support.

The Medcom is a 16:9 15" terminal that is used for patient infotainment
in hospitals.

Changes in v3:
  * Remove unused implementation of gpio_config_uart().
  * Implement MMC/SD card detection.
  * Drop board_mmc_getcd() which is now implemented by common Tegra2
    code.
  * Add MAINTAINERS entry.

Changes in v2:
  * No longer override the default CONFIG_SYS_TEXT_BASE setting.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 3160ec5..4bf12b5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -786,6 +786,7 @@
 Thierry Reding <thierry.reding@avionic-design.de>
 
 	plutux		Tegra2 (ARM7 & A9 Dual Core)
+	medcom		Tegra2 (ARM7 & A9 Dual Core)
 
 Tom Rini <trini@ti.com>