[ARM] Orion: initialize UART1 on Kurobox Pro/Linkstation Pro

Kurobox Pro/Linkstation Pro devices use a microcontroller connected
to UART1.  As most of the communication with this microcontroller is
done from userland (power button detection, fan speed ...), the setup
file has to make UART1 available from userland.

Signed-off-by: Sylver Bruneau <sylver.bruneau@googlemail.com>
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>