ARM: dts: am335x-pcm-953: Update user led names

Rename user led nodes to match the phytec user leds name scheme.
Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am335x-pcm-953.dtsi

@@ -39,15 +39,13 @@ user_leds: user_leds {
 		pinctrl-names = "default";
 		pinctrl-0 = <&user_leds_pins>;
 
-		green {
-			label = "green:user";
+		user-led0 {
 			gpios = <&gpio1 30 GPIO_ACTIVE_HIGH>;
 			linux,default-trigger = "gpio";
 			default-state = "on";
 		};
 
-		yellow {
-			label = "yellow:user";
+		user-led1 {
 			gpios = <&gpio1 31 GPIO_ACTIVE_LOW>;
 			linux,default-trigger = "gpio";
 			default-state = "on";