ARM: dts: armada-385-linksys: label nodes

Add labels to nodes used by dependants. Also rename node gpio_keys to
gpio-keys to match the style of the rest of the file as well as the
documented example.
Signed-off-by: Ralph Sennhauser <ralph.sennhauser@gmail.com>
Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>

arch/arm/boot/dts/armada-385-linksys.dtsi

@@ -79,7 +79,7 @@ reg_xhci0_vbus: xhci0-vbus {
 		gpio = <&gpio1 18 GPIO_ACTIVE_HIGH>;
 	};
 
-	gpio_keys {
+	gpio_keys: gpio-keys {
 		compatible = "gpio-keys";
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -99,7 +99,7 @@ button@2 {
 		};
 	};
 
-	gpio-leds {
+	gpio_leds: gpio-leds {
 		compatible = "gpio-leds";
 		pinctrl-0 = <&power_led_pin &sata_led_pin>;
 		pinctrl-names = "default";
@@ -210,7 +210,7 @@ tmp421@4c {
 		reg = <0x4c>;
 	};
 
-	pca9635@68 {
+	expander0: pca9635@68 {
 		#address-cells = <1>;
 		#size-cells = <0>;
 		compatible = "nxp,pca9635";