uboot-cubieboard2 lacked support for controlling the green led

The board started with green led turned on and /sys/class/led/green:ph20:led1 was missing
Patch made following the directions found on http://linux-sunxi.org/Cubieboard/Programming/StatusLEDs
Merge pull request #792 from muxator/master

uboot-cubieboard2 lacked support for controlling the green led