power: Get panel backlight brightness from lights helper

Change-Id: I3f28fc4abac947cc4a30d95ba74f45bf24c12c20
diff --git a/power/Android.mk b/power/Android.mk
index 92ffe61..53f60b4 100644
--- a/power/Android.mk
+++ b/power/Android.mk
@@ -23,6 +23,7 @@
 LOCAL_C_INCLUDES := $(LOCAL_PATH)/include
 
 LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_STATIC_LIBRARIES := liblights_helper
 
 LOCAL_MODULE := power.$(TARGET_BOOTLOADER_BOARD_NAME)
 LOCAL_MODULE_RELATIVE_PATH := hw