mvebu: Configure status LED for WRT1900ACS

Signed-off-by: Rujun Wang <[email protected]>

target/linux/mvebu/base-files/etc/diag.sh

@@ -6,6 +6,9 @@
 
 get_status_led() {
 	case $(mvebu_board_name) in
+	armada-385-linksys-shelby)
+		status_led="shelby:white:power"
+		;;
 	armada-xp-linksys-mamba)
 		status_led="mamba:white:power"
 		;;