tegra2: Add support for Ventana

Ventana is a board which is very similar to Seaboard. Support it by
re-using board/nvidia/seaboard/seaboard.c with minor run-time conditionals.

v5: Makefile: Use cmd_link_o_target, remove unused clean/distclean targets.
v6: Make gpio_config_uart_seaboard() static.
v7: Add MAINTAINERS entry for Ventana. Tom Warren doesn't have Ventana, so
    he asked me to add myself for this board.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index 8bb7572..4ffdc6c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -876,6 +876,11 @@
 	harmony		Tegra2 (ARM7 & A9 Dual Core)
 	seaboard	Tegra2 (ARM7 & A9 Dual Core)
 
+Tom Warren <twarren@nvidia.com>
+Stephen Warren <swarren@nvidia.com>
+
+	ventana		Tegra2 (ARM7 & A9 Dual Core)
+
 Thomas Weber <weber@corscience.de>
 
 	devkit8000	ARM ARMV7 (OMAP3530 SoC)