odroid: Turn blue LED on

To indicate that U-Boot is active, turn on the blue LED.

Signed-off-by: Suriyan Ramasami <suriyan.r@gmail.com>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>