Following what's done in Raspberry Pi's defconfigs, let's
unify the consoles in Minnowboard Max defconfigs, providing
consoles on HDMI and serial port.
[Peter: use tty1 like on rpi]
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>