ARM: ux500: add default trigger on HREF LED

This adds a heartbeat on the first LED on the ux500 HREF
boards.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-href.dtsi

@@ -72,6 +72,7 @@ lp5521@33 {
 				chan0 {
 					led-cur = /bits/ 8 <0x2f>;
 					max-cur = /bits/ 8 <0x5f>;
+					linux,default-trigger = "heartbeat";
 				};
 				chan1 {
 					led-cur = /bits/ 8 <0x2f>;