bmips: sercomm,ad1018: remove unneeded LED default-state

Remove unneeded default-state from led_power_green (led@8) to be in line with
other bmips devices.

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bmips/dts/bcm6328-sercomm-ad1018.dts

@@ -109,7 +109,6 @@
 		active-low;
 		function = LED_FUNCTION_POWER;
 		color = <LED_COLOR_ID_GREEN>;
-		default-state = "on";
 	};
 
 	led@10 {