ARM: dts: turris-omnia: enable LED controller node

The LED controller node is disabled because the leds-turris-omnia driver
does not support setting the LED blinking to be controlled by the MCU.

The patches for that have now been sent [1], so let's enable the node.

[1] https://lore.kernel.org/linux-leds/20220704105955.15474-1-kabel@kernel.org/T/



Signed-off-by: Marek Behún <kabel@kernel.org>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>