buildroot

minnowboard-max: Start X on boot and run a few demos

Now that we've merged nodm, the autologin display manager, we can
get rid of xinit, and startx hack and use nodm to start X on boot.
While here, let's start xterm and glmark2, just as demos.

Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>