ARM: dts: armada: Add default trigger for sata led

In others board we have the sata led set to function
with the sata led trigger by default.
This patch makes the same for these board that have sata
led but get disabled by not associating it to any trigger.

Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>