Add tegra20-common-post.h to be consistent with other tegra20 boards.
Signed-off-by: Allen Martin <amartin@nvidia.com> Acked-by: Thierry Reding <thierry.reding@avionic-design.de> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Tested-by: Thierry Reding <thierry.reding@avionic-design.de> Signed-off-by: Tom Warren <twarren@nvidia.com>