mips: mt7688: gardena-smart-gateway: Enable green power LED on startup

Set the correct power-up state (default-state) of the green power LED.
Signed-off-by: NStefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

arch/mips/dts/gardena-smart-gateway-mt7688.dts

@@ -34,7 +34,7 @@
 		power_green {
 			label = "smartgw:power:green";
 			gpios = <&gpio0 19 GPIO_ACTIVE_HIGH>;
-			default-state = "off";
+			default-state = "on";
 		};
 
 		power_red {