ledtrig-sleep: Add led trigger for sleep debugging.

Signed-off-by: Brian Swetland <swetland@google.com>
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index bbfd2e3..cb77b9b 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -54,3 +54,4 @@
 obj-$(CONFIG_LEDS_TRIGGER_BACKLIGHT)	+= ledtrig-backlight.o
 obj-$(CONFIG_LEDS_TRIGGER_GPIO)		+= ledtrig-gpio.o
 obj-$(CONFIG_LEDS_TRIGGER_DEFAULT_ON)	+= ledtrig-default-on.o
+obj-$(CONFIG_LEDS_TRIGGER_SLEEP)	+= ledtrig-sleep.o