leds: Add default-on trigger

Add a trigger which allows LEDs to default to the full
brightness state.

Signed-off-by: Nick Forbes <Nick.Forbes@huntsworth.com>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 9adfa2f..973d626 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -26,3 +26,4 @@
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)	+= ledtrig-timer.o
 obj-$(CONFIG_LEDS_TRIGGER_IDE_DISK)	+= ledtrig-ide-disk.o
 obj-$(CONFIG_LEDS_TRIGGER_HEARTBEAT)	+= ledtrig-heartbeat.o
+obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o