ar71xx: use the RB912UAG-{2, 5}HPnD Power LED for diag

The Power LED of RB912UAG-{2,5}HPnD boards can be controlled by sofware,
so use it for diag purposes and make the User LED free for other tasks.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>

target/linux/ar71xx/base-files/etc/diag.sh

@@ -316,8 +316,6 @@ get_status_led() {
 	rb-911g-2hpnd|\
 	rb-911g-5hpacd|\
 	rb-911g-5hpnd|\
-	rb-912uag-2hpnd|\
-	rb-912uag-5hpnd|\
 	rb-941-2nd|\
 	rb-951ui-2nd|\
 	rb-952ui-5ac2nd|\
@@ -329,6 +327,8 @@ get_status_led() {
 	rb-951ui-2hnd)
 		status_led="rb:green:act"
 		;;
+	rb-912uag-2hpnd|\
+	rb-912uag-5hpnd|\
 	rb-sxt2n|\
 	rb-sxt5n)
 		status_led="rb:green:power"