arm: mvebu: Fix LED color in NETGEAR ReadyNAS 102 .dts file

When writing initial .dts file for NETGEAR ReadyNAS 102, I put the wrong color
for backup and SATA leds (green instead of blue for all three).

Reported-by: Johan Kristell <johan.kristell@gmail.com>
Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/4eb4049d934a3a8fe9f7235dafb6842422792566.1414185031.git.arno@natisbad.org
Signed-off-by: Jason Cooper <jason@lakedaemon.net>