brcm63xx: Livebox 1: use button 1 as failsafe button

Fix the DTS file for the Livebox 1 routers:
- no failsafe button, use button 1 for this purpose

Signed-off-by: Daniel Gonzalez Cabanelas <dgcbueu@gmail.com>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>

target/linux/brcm63xx/dts/livebox-blue-5g.dts

@@ -21,13 +21,13 @@
 		debounce-interval = <60>;
 
 		button1 {
-			label = "BTN_1";
+			label = "1";
 			gpios = <&gpio1 4 1>;
-			linux,code = <BTN_1>;
+			linux,code = <KEY_RESTART>;
 		};
 
 		button2 {
-			label = "BTN_2";
+			label = "2";
 			gpios = <&gpio0 7 1>;
 			linux,code = <BTN_2>;
 		};