mvebu: LS421DE: improve the HDD leds

Improve the HDD LEDs used for disk activity:
 - Use the trigger activity per ata channel

Signed-off-by: Daniel González Cabanelas <[email protected]>

target/linux/mvebu/files/arch/arm/boot/dts/armada-370-buffalo-ls421de.dts

@@ -153,14 +153,14 @@
 			label = "ls421de:red:hdd1";
 			gpios = <&gpio1 29 GPIO_ACTIVE_HIGH>;
 			default-state = "off";
-			linux,default-trigger = "disk-activity";
+			linux,default-trigger = "ata1";
 		};
 
 		hdd2_red {
 			label = "ls421de:red:hdd2";
 			gpios = <&gpio1 30 GPIO_ACTIVE_HIGH>;
 			default-state = "off";
-			linux,default-trigger = "disk-activity";
+			linux,default-trigger = "ata2";
 		};
 	};