ARM: dts: kirkwood: Remove button address and fixup names

The DT compiler is now warning about unit names with addresses but not
reg property. Fix all the gpio-key buttons which causes warnings.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
diff --git a/arch/arm/boot/dts/kirkwood-cloudbox.dts b/arch/arm/boot/dts/kirkwood-cloudbox.dts
index 7ec7656..555b7e4 100644
--- a/arch/arm/boot/dts/kirkwood-cloudbox.dts
+++ b/arch/arm/boot/dts/kirkwood-cloudbox.dts
@@ -60,7 +60,7 @@
 		#address-cells = <1>;
 		#size-cells = <0>;
 
-		button@1 {
+		power {
 			label = "Power push button";
 			linux,code = <KEY_POWER>;
 			gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;